Join Date: Apr 2017
Location: Broward County Florida
Vehicle: 2002 Black SLK320
Other Toys: 1995 Chrysler Lebaron Convertible
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Check Engine Light Endless Error
2002 SLK320 it all began with wanting the Check Engine light off as in fixed not black tape despite the car apparently running just fine IMHO. Actually using a scanner this time, cheap Memoscan orange CAN OBD2 U480 which does retrieve codes and can clear them. Began with P0105 MAP/BARO circuit malfunction. Easy enough, ordered a brand new MAF on ebay, installed it and cleared code. Code changed to P0410 Secondary air induction system. Googled that and another MB forum suggested changing out the Check Valves, EGR Valve, Air Pump. Due to price obtained a pair of used Check Valves and installed them with new gaskets and cleared codes. A good high speed 70 mph run returned the codes for 171 and 174 System too lean Banks 1 and 2. This happened once, after clearing has not returned during local runs around town. Gas MPG improved from 12 to 17 only one fillup since change so will wait and see what the future holds. Clearing these bounced me back to 410, ordered a brand new OEM EGR and installed today and cleared code, only to get 410 back. Only thing left would be the little blue valve in the EGR line and the air pump, or put back the old MAF and live with 105 if that's any advantage over 410.
I do find it strange the car has to be turned off and the key removed and restarted for check engine to come on and codes to be available, potential to drive a hundred miles or more with check engine poised to come on at next restart.
Last edited by RobertP; 02-14-2018 at 10:37 AM.