O2 Sensor Replacement Cost . . . - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

 1Likes
  • 1 Post By efair
 
LinkBack Thread Tools
#1 Old 05-23-2012
Registered Users
 
Join Date: Nov 2011
Location: South Carolina
Vehicle: 2001 SLK320
Posts: 393
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 26
Thanked 68 Times in 39 Posts
Garage
(Thread Starter)
Unhappy O2 Sensor Replacement Cost . . .

I have sort of asked about O2 sensors before, but not really in regards to cost . . . I had replaced the O2 sensor (singular!) in my V-6 Probe so I didn't really think too much about it until I decided to see what it would actually cost to get it resolved before my holiday weekend drive. (My engine service light had come on for a bit again.)

$1950!!!

And about $1000+ of that is for the sensors! (4 of them) And then because I also get an "air pump" error code, (about 1-8 to the aging O2 Sensor code) my service rep sort of indicates that the O2 sensors might not be the end of the problem . . . (This is all after a $100+ (refundable) diagnostic . . . )

The small shop I found near Charlotte said they could do it with Bosch parts for about $13-1400 . . . almost worth the drive if I was headed that way . . . The car seems to run ok otherwise, so it isn't a do or die thing at the moment. But this is sort of a big downer in my effort to keep the car running.

(I didn't expect that, the way to get a MB to 1,000,000 miles was by rebuilding the car (at 25% the cost of a new one!) every 100,000 miles.)

Anyone else have some stories/alternatives? I didn't think O2 sensors were to go bad unless they were really abused? (Bad gas . . . whatever. I replaced the Probe's at 150K as a precaution, and that one ran me like $50.) I can get a set of O2 sensors online for about $700 . . . How hard are they to replace?


lilred320SLK is offline  
Sponsored Links
Advertisement
 
#2 Old 05-23-2012
aka John

 
UK-C200's Avatar
 
Join Date: May 2008
Location: Richmond, Tx
Vehicle: LHD Black SLK350, LHD Firemist SLK55
Other Toys: Nacra F18
Posts: 13,012
Country:
Chats: 1143
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Thanks: 1,712
Thanked 2,920 Times in 2,028 Posts
0015403717 is the rear sensor, MSRP $250, so figure you can get them for $180.

0015405017 is the front sensor, MSRP $225, so figure you can get them for $160.

That's for OEM parts, you can get Bosch 16167's (front) for $75, and W0133-1603854 for the rears at $85. Bosch is the OEM for MB.

They are fiddly to get to on the R171, but very doable - you literally unscrew the old and screw in the new. I don't know enough about the layout of the '320 exhaust, but I can't imagine it's all that bad...

Maybe one of the R170's guys will chime in.

EDITED : so figure that those Bosch prices are not more expensive than what your indy is going to pay, that's $320 for sensors, and a grand for labor.

Either the R170 is impossible to replace these without dropping the whole exhaust - which seems odd - or I'm really missing something. 8-10 hours labor to drop/replace the exhaust seems excessive to me. Again, hopefully one of the R170 guys can chime in here....



UK-C200 is offline  
#3 Old 05-23-2012
Registered Users
 
Join Date: Nov 2011
Location: South Carolina
Vehicle: 2001 SLK320
Posts: 393
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 26
Thanked 68 Times in 39 Posts
Garage
(Thread Starter)
Have just seen "non OEM" types on Rock Auto for between $50 (clearance) to $70-80 (no-name) to just over $100 for Denzo, $120 for Bosch, and $212 for OE "quality" . . .

From MyMercedesParts it would be about $170 + S&H. (OE Quality??)

The question either way still is, how hard are they to get too?
lilred320SLK is offline  
 
#4 Old 05-23-2012
aka John

 
UK-C200's Avatar
 
Join Date: May 2008
Location: Richmond, Tx
Vehicle: LHD Black SLK350, LHD Firemist SLK55
Other Toys: Nacra F18
Posts: 13,012
Country:
Chats: 1143
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Thanks: 1,712
Thanked 2,920 Times in 2,028 Posts
Look harder for the Bosch - I see 'em on Amazon for the prices I put in my post. On the other question, that's the one I can't answer! :P



UK-C200 is offline  
#5 Old 05-23-2012
Registered Users
 
Join Date: Nov 2011
Location: South Carolina
Vehicle: 2001 SLK320
Posts: 393
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 26
Thanked 68 Times in 39 Posts
Garage
(Thread Starter)
One of the problems with O2 sensors . . . they seem to be all over the place! (Both in quality and price.)

The cheap ones sort of come in a "roll your own" kit where I guess you have to attach the old plug. But really, is that the difference between a $50 and a $100 sensor? Just the attached plug?

I've also noticed that there is a Bosch "Super Class" Sensor for about $10 more than the normal direct replacement unit; $114 v $123 at Auto Parts Warehouse . . . The super class is supposed to have additional filters to make it last longer. (Since my OEMs seemed to have lasted only about 100k, the extra filters might be a good thing.)


Where my story gets a little funny is that, (after he told me the est., and I about fainted! (but I remained civil) the service rep told me what his mechanic had told him . . . Since I still had most of the panels out of my car for the other work I’m doing, the mechanic thought I was just going to go someplace else and put them in myself! And I sort of thought, WTF (bunch of arrogant so & so's . . . ) for a couple of reasons;

1) It was my car and I paid the $100 diagnostic charge . . . Like for some reason I didn't deserve this information?

2) Since I paid the diagnostic, what was it to them really if I did it myself? (I'd get no "warranty" from them, if I screwed it up, it would all be on me.)

3) I had told the Service Rep prior to their estimate that it was probably the O2 sensor since I had seen it come up before. ( I just hadn't realized there were 4 of them and had no idea of the cost!)


What made it really funny though was that, since I did have the car in pieces, I told him a bit of what I had done. (Changed out the headliner and moldings, changed out the radio CD player, got the roof cylinders rebuilt/reinstalled, (to which he said, "You saved a bundle on that!") cleaned off the rear console, etc. . .)

He damn near offered me a job! (He goes, "You know you could make a lot of money doing that on Saturdays!)

I told him (truthfully) that I really didn't like working on engines in my apartment lot. (No lift, etc.) And I really wanted to say to him, that, if his price was more competitive, I wouldn’t feel a need to do it on my own.

(I did see an SLS in the showroom . . . I guess most of the folks who buy that don’t change their own oil either! (Actually I have never changed mine in this car; I've let the dealer do the scheduled services. So it's not like they haven't made some money off of me.)
lilred320SLK is offline  
#6 Old 05-23-2012
Premium Member
 
Join Date: May 2010
Location: Atlanta
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
Posts: 4,315
Country:
Chats: 0
Mentioned: 594 Post(s)
Tagged: 0 Thread(s)
Quoted: 913 Post(s)
Thanks: 155
Thanked 520 Times in 481 Posts
I can't answer your questions but yes -- an air pump code is likely a different problem from an O2 code. Not definitely but likely. Your mechanic was right on "may be more issues". If you run your car too long with a defective O2 sensor I've heard it can ruin your catalytic converter (which is a much more expensive repair than an O2 sensor). O2 sensors do have replacement intervals, they don't last forever. However, it's also possible you only need to replace one sensor -- did the diagnostic call out a specific one?
Gunther likes this.
efair is online now  
#7 Old 05-24-2012
Registered Users

 
Gbarringer100's Avatar
 
Join Date: May 2009
Location: Little River, SC
Vehicle: 2013 SLK250
Other Toys: 2016 GLA250
Posts: 2,317
Country:
Chats: 0
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 100 Post(s)
Thanks: 12
Thanked 404 Times in 350 Posts
Garage
Why replace all 4, the code should tell you which one is bad and just replkace the bad one. I had a 230 and the one in front of cat would go bad and the one behind the cat was all ways good. There was different codes for each one.
Gbarringer100 is offline  
#8 Old 05-24-2012
Registered Users

 
sokoloff's Avatar
 
Join Date: Jun 2009
Location: Ocean Isle Beach, NC
Vehicle: 2003 SLK320 31,000 miles
Posts: 1,314
Country:
Chats: 3
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Thanks: 27
Thanked 231 Times in 161 Posts
Garage
As for the warranty issue, if you buy a genuine Mercedes part and it fails within the warranty period (one year generally), the part and the labor to replace it is covered by Mercedes regardless of who installed the part.

Also, there have been loads of complaints about cheap Chinese sensors that fail quickly. You certainly don't need to buy OE, but don't always go by price alone.

Len

Len
2003 SLK320 40,000 miles - now lives in Tucson with my daughter
1959 220S Cabriolet - sold - now lives in Malta
1983 240D 351,000 miles original owner - sold
1999 E300D 215,000 miles
2014 Smart electric 17,000 miles
2014 Smart electric 9,000 miles
sokoloff is offline  
#9 Old 05-24-2012
Registered Users
 
Join Date: Nov 2011
Location: South Carolina
Vehicle: 2001 SLK320
Posts: 393
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 26
Thanked 68 Times in 39 Posts
Garage
(Thread Starter)
Quote:
Originally Posted by sokoloff View Post
. . . Also, there have been loads of complaints about cheap Chinese sensors that fail quickly. You certainly don't need to buy OE, but don't always go by price alone. . . .
I typically don't go with the absolute low dollar solution since I do entertain the idea of keeping the car for another 100k/10 years. (I don't want to be the one "stuck" fixing something again a few years down the road. Of course if I ever got a garage and some form of a lift, I could be a bit more flexible on that.)

So I'll probably try the "super Class" if I decide to do it; see what the extra $40-50 gives me.

The main shocker on this for me was that there are 4 of the dang things!! How could my 3L V6 Probe run adequately well with one, and this needs 4? (I could see 2 if they were keeping the exhaust stream separate or because of where the two exhaust banks joined up down stream . . .) I do get a bit more hp out of the MB (215 v 160) but the MB runs at a higher compression and needs premium gas. Which might be the concern I guess; a high compression combustion process normally will produce more (NOx) pollutants than a low one. I just can't see how much more actively the MB can be using the O2 information to adjust the various engine parameters.
lilred320SLK is offline  
#10 Old 05-24-2012
Premium Member
 
Join Date: May 2010
Location: Atlanta
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
Posts: 4,315
Country:
Chats: 0
Mentioned: 594 Post(s)
Tagged: 0 Thread(s)
Quoted: 913 Post(s)
Thanks: 155
Thanked 520 Times in 481 Posts
There's got to be at least one in each exhaust stream; if you have a dual exhaust you have at least two then. Those two are typically upstream of the catalytic converter. Then, if you want to measure how effectively your cats are working (as any good system does) you also put a sensor downstream of each cat -- for a total of four sensors if you have a dual exhaust. Your V6 probe probably had a single exhaust and a more basic engine management system than your SLK.
efair is online now  
#11 Old 05-24-2012
Registered Users
 
Join Date: Nov 2011
Location: South Carolina
Vehicle: 2001 SLK320
Posts: 393
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 26
Thanked 68 Times in 39 Posts
Garage
(Thread Starter)
Quote:
Originally Posted by efair View Post
. . . Your V6 probe probably had a single exhaust and a more basic engine management system than your SLK. . . .
But it always got me there, didn't cost three arms and four legs to fix, and actually got me better mileage (with it's more basic EMS) and similar performance (since it weighed in quite a bit less) on cheaper gas to boot!!

(And yes, I would probably still be driving it if a mechanic hadn't screwed up the engine rebuild. And that was still going to cost me less than the MB's 4 O2 sensors and the interior mirror!)

That's not to say that there isn't some degree of usefulness in the 4 sensor design as you noted, but there is always a point where there is a rate of diminishing return, particularly on any control system. It should have at least lasted twice as long since each side of the exhaust only saw half the flow! (I know it doesn’t quite work that way, but I’m still looking for my benefit from the design! The main benefit I see is for the dealers and the parts suppliers.)

So, compared to my Probe for example, (don't beat up on my old car!) and including inflation, the MB sensors will cost me 5 times as much for potentially 2/3rds the durability . . . (I'll give it the benefit of the doubt on the durability because I can't quantify any leeway in the replacement schedule. I might have been late on the Probe’s, but still a bit early on the MBs.)

My perspective still is that one doesn't/shouldn't expect to have to spend 25% of the value of the car every 10 years, barring accident, abuse or catastrophic failure, to keep it running reasonably well.

Anyway, I’m beginning to think that I might be able to get to the O2 sensors. I will need to get the car up so I can get under it though. (I will have to borrow some ramps and a friends driveway perhaps . . .)
lilred320SLK is offline  
#12 Old 05-24-2012
aka John

 
UK-C200's Avatar
 
Join Date: May 2008
Location: Richmond, Tx
Vehicle: LHD Black SLK350, LHD Firemist SLK55
Other Toys: Nacra F18
Posts: 13,012
Country:
Chats: 1143
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Thanks: 1,712
Thanked 2,920 Times in 2,028 Posts
There are a *lot* of things than can effect the lifespan of on an o2 sensor. I've a friend up the road with a W203 that's got 145k on it, and the original sensors...



UK-C200 is offline  
#13 Old 05-24-2012
Premium Member
 
Join Date: May 2010
Location: Atlanta
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
Posts: 4,315
Country:
Chats: 0
Mentioned: 594 Post(s)
Tagged: 0 Thread(s)
Quoted: 913 Post(s)
Thanks: 155
Thanked 520 Times in 481 Posts
My 88 volvo wagon has 280K on the original 02 sensor. It always gets me there too, and with better mileage. The better the sensors, the better the diagnostics, so you're right -- the real benefit goes to the one performing the diagnostics.
efair is online now  
#14 Old 05-25-2012
Registered Users
 
Join Date: Nov 2011
Location: South Carolina
Vehicle: 2001 SLK320
Posts: 393
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 26
Thanked 68 Times in 39 Posts
Garage
(Thread Starter)
Quote:
Originally Posted by efair View Post
My 88 volvo wagon has 280K on the original 02 sensor. It always gets me there too, and with better mileage. The better the sensors, the better the diagnostics, so you're right -- the real benefit goes to the one performing the diagnostics.
Sorry I'm a bit confused . . . I would suspect that at 280k you have been very lucky indeed -or- the way your Volvo monitors the O2 sensor is less strict than the SLKs. (From 1988, the system might just ask for an "All present and accounted for!") How many does it have by the way?

The job of the O2 sensor is to give a level/value ("number") back to the Engine Control Module based on the percentage of oxygen in the exhaust stream, which the ECM then uses to adjust whatever parameters it sees fit. (Spark advance, mixture, etc.) Functionally, as I understand it, this value is being generated at the sensor's surface due to a chemical/electrical reaction of the oxygen and the sensor element; due to the extreme nature of the exhaust gasses, this element is subject to various causes of wear and erosion. After a certain amount of time and or use, it just doesn't react as it is supposed to and therefore needs replacement.

The length of time over which this occurs is obviously variable, and probably not all that well understood. I would assume that through testing, the manufacturers have determined what is a probable working lifespan. In most cases I've seen, this works out to a 100,000 mile replacement recommendation. I don't know if this recommendation is listed as part of the SLK's service schedule; but if so, I need to expect to spend $2k/100,000 miles if I'm interested in keeping my dealer (and car) happy.

Now to the failure code, again as I understand it; the failure code is being generated by a situation where the ECM is expecting to see a certain level of (electrical) activity through the sensors' circuit at a certain point in the start up cycle. This activity (or reference value) is expected to change significantly as the sensor becomes less accurate, mostly due to age and wear. Certainly if you get a good set they might last a bit longer, but whether they are good or bad, cheap or expensive (as long as they meet the design standard) they wouldn’t help to give better diagnostics. (The sensor gives a value, the ECM determines if that value is good or bad.) They would, to some degree, give you better or worse engine performance (power/mileage/smoothness, etc.) depending on how tightly the systems are tied together.

Anyway we look at it though, it seems like the V-6 is rather expensive to keep up in this regard. (Probably twice as much as the I-4t. I would suspect that replacing individule sensors is probably not a good cost saving path.) Of course a lot of that cost seems to be in the dealer's "mark up" though.
lilred320SLK is offline  
#15 Old 05-25-2012
Premium Member
 
Join Date: May 2010
Location: Atlanta
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
Posts: 4,315
Country:
Chats: 0
Mentioned: 594 Post(s)
Tagged: 0 Thread(s)
Quoted: 913 Post(s)
Thanks: 155
Thanked 520 Times in 481 Posts
It just has one, Bosch LE system.
efair is online now  
#16 Old 05-26-2012
Registered Users
 
Join Date: Nov 2011
Location: South Carolina
Vehicle: 2001 SLK320
Posts: 393
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 26
Thanked 68 Times in 39 Posts
Garage
(Thread Starter)
Quote:
Originally Posted by efair View Post
It just has one, Bosch LE system.
My Probe was a '91 . . . . Ah for the good ol' days . . .
lilred320SLK is offline  
Sponsored Links
Advertisement
 
Reply

  Lower Navigation
Go Back   Mercedes Benz SLK Forum > Mercedes Benz R170 SLK Class Cars > SLK R170 General Discussion

Bookmarks

Quick Reply
Message:
Options
Upload your files to MEGAUPLOAD
Upload your images to ImageShack

Register Now



In order to be able to post messages on the Mercedes Benz SLK Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Cost of Driving Is Way Up! Gregg General Discussion 18 07-13-2010 01:55 AM
Maintenance cost Tslick General Discussion 3 10-08-2006 08:53 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
 

Clubs, Garage Plus vBulletin Plugins by Drive Thru Online, Inc.