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Registered 2002 SLK320
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Discussion Starter #1
My 2002 SLK320 seems to run fine though the check engine light is on which bugs me. The dash and generic scanner show 105 MAP/BARO Circuit Malfunction so I find a new after market MAP sensor tube thing on ebay for $22 w/shipping and install it. Now the 105 has gone away and showing 113 IAT Sensor 1 Circuit High Input.

So, where is it, how much trouble to change out and would this be the fix or the trigger for yet another code, what comes next? For that matter should I go back to the old MAP and live with 105? I mean, is 113 better or worse than 105 would think both would have shown, weird one blocking the other like that . . .

Have read third party MAPs are often bad, or is there more to this circuit business.

Mercedes codes:
P0105 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction
P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input
P0109 Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent
P0110 Intake Air Temperature Circuit Malfunction
P0111 Intake Air Temperature Circuit Range/Performance Problem
P0112 Intake Air Temperature Circuit Low Input
P0113 Intake Air Temperature Circuit High Input

Thanks Robert
 

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Registered 2002 SLK320
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Discussion Starter #4
Poked around some and the code changed from P0113 to P0115, not P0113/P0115, but to just P0115 found this online . . .

P0115 MERCEDES-BENZ - Engine Coolant Temperature Circuit Malfunction 0 | Add Comment Possible causes Low engine coolant level Faulty Engine Coolant Temperature (ECT) sensor Faulty engine coolant thermostat Engine Coolant Temperature (ECT) sensor harness is open or shorted Engine Coolant Temperature (ECT) sensor circuit poor electrical connection What does this mean? When is the code detected? An excessively low or high voltage from the sensor is sent to Engine Control Module (ECM). Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) P0115 MERCEDES-BENZ Description The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

Read more: https://www.autocodes.com/p0115_mercedes-benz.html

Ok, then if it's the coolent level is Prestone 50/50 alright to top it off, likely what Midas is already putting in there or do I need some exotic expensive brand? I'm changing out the dual valve in a couple of days so good chance I'm going to need some coolant anyway. If that doesn't fix it, what order of things to try next? The temp sensor seems to be sending to the gauge no problem.

Secondary question. My old MAP had a big black plastic clamp around it with two paddles to squeeze it closed. One side has a pivot pin the other a J shaped support likely for a hose. I can see no use for this thing as there is no hoses there that can use the support. I'm wondering if the clamp is from a 230 as I suspect this was used as a parts car at some point.
 

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If you have been poking around have you disturbed anything? I take it you have a MIL on now due to the P0115 code. Check wiring and connectors. Remove and clean coolant temp sensor plug. If you are going to lose coolant during the next job then just top up with water for now and buy the correct Mercedes rated additive next time. Try and get this sorted 1st as this code could relate to a thermostat that is stuck causing the coolant temp to go outside expected parameters. You would need to drain the coolant again to replace the stat.
So, to re-cap. Could be faulty ECT sensor, low coolant level, bad connection in wiring or stuck thermostat.
I guess you will have to go through things one by one. At least nothing is overly expensive.
Don't forget to check the coolant level sensor and wiring.
 

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Premium Member 2001 SLK320/2000 SLK230
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"the other a J shaped support likely for a hose. I can see no use for this thing as there is no hoses there that can use the support." If this one, my 320 has a hose in it. Are you missing something (have to pull the cover to see where it goes).

ps if a faulty coolant temp sensor, wouldn't the gauge be off ?
 

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@Padgett I think you are right, the gauge would start to go off. Problem with the thermistor sensors is they start to go out of range when failing and these cars are quite fussy about temp. I have read somewhere that they allow a certain amount of time during warm up to see the correct pre programmed coolant temp rise. If it doesn't happen 3 times in a row the P0115 comes up. Not sure how much tolerance is built in to this.
 

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Registered 2002 SLK320
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Discussion Starter #8
Started looking into where to buy Mercedes engine coolant local and on ebay, several numbers and a warning not to mix blue with yellow. Checked the car fully expecting to find green ;-) only to find clear. Drew some out on a white paper towel twist and what I have is totally clear with no antifreeze smell, but does have a slippery feel to it. Tank is about a quarter full cold, didn't see a suggested fill too mark. Ah, what color would you put in there or if I drain and replace what color or number to go with in Florida?
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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Started looking into where to buy Mercedes engine coolant local and on ebay, several numbers and a warning not to mix blue with yellow. Checked the car fully expecting to find green ;-) only to find clear. Drew some out on a white paper towel twist and what I have is totally clear with no antifreeze smell, but does have a slippery feel to it. Tank is about a quarter full cold, didn't see a suggested fill too mark.
Manual tells:

Refill
coolant until the float in the reservoir reaches and
closes the filler opening.
 

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Registered 2002 SLK320
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Discussion Starter #10
The coolant level dash light does not stay on after the engine starts so I can't see the coolant level being the cause of the check engine light and P0115 if the coolant light doesn't stay on. The manual pdf only says to replace with MB Anticorrosion/antifreeze, yet on ebay I'm finding different numbers and colors, in this case I'd prefer not to rely on the ebay this fits your car tool. What MB product number is specific for SLK320?
 

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Registered 2002 SLK320
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Discussion Starter #12
I don't know the MB part No. but you can use their antifreeze or best of the rest Zerex G-05
Had the Chrysler in at Midas today and asked for an estimate for a coolant system drain and refill for the SLK320 and what they would be using. They called someone who told them to use Blue Yourapee'n strange I'd have thought that would be the yellow. $109 plus whatever the coolant costs above their usual.

"What was Zerex G-O5 color? - MBWorld.org Forums
https://mbworld.org › ... › Mercedes-Benz Sedans › E-Class (W210)
May 6, 2010 - 9 posts - ‎3 authors
In an email response from the makers (Valvoline) of Zerex G05 they stated it is NOT the same as the Mercedes Benz Antifreeze. It is COMPATIBLE only. [source: sokoloff @benzworld.org] Also, some are reporting that the blue colored MB antifreeze sold in Europe is now starting to show up in the US."

Appears Zerex G-05 is yellow, http://www.whitfieldoil.com/downloads/ZerexAntifreezeCoolantApplicationChart.pdf
would add to the confusion if the car ever went to the dealer, but affordable seeing as they sell it at some Walmarts.
 

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Registered 2002 SLK320
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Discussion Starter #13
Arrrrrrrrrrrrrrrrgh!!! Guess this is what happend when you're drain bammaged. Had to be a lottery winner kind of event.

I plugin my generic OBD2 code reader, let it settle in and turn on the ignition without starting the car, comes up with Code Po105 the Map Circuit Malfunction at the same time I notice the odometer is showing a Wrench and the number 105 and say to myself, why am I using a code reader when the dash is giving me the codes?

Order a new Map Sensor and install it. Turn on the car and the dash says 113. Two days later it says 115, five days later it says 120 and I finally realize this is a count-up from the suggested service date, which was done and supposedly cleared I thought, never noticed until the Check Engine light came on.

And so I go back out with the OBD2 and the 105 code is gone ya! And now I have code Po410 Secondary Air Infection Air System Malfunction. Looked that up and found I need to check, clean or replace the Check Valves, check hoses, fix might move problem to the EGR valve.

Thanks for the coolant system info, will pick up some blue coolant before replacing the dual valves to get both center vents to blow cold.
 
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