Possible Mass Airflow Sensor ripoff? - Page 2 - Mercedes-Benz Forum

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post #11 of 11 (permalink) Old 10-30-2015, 04:44 PM
TJC
BenzWorld Junior Member
 
Date registered: Oct 2006
Vehicle: 2001 E320
Location: Southern California
Posts: 8
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Quoted: 1 Post(s)
Hi Greg,

I am having a challenge with the MAF. I have a 2001 W210 e320. About a year ago in Big Bear, about 7,000 feet above sea level, the BAS/ESP light came on and throttle response disappeared. After stopping and restarting the car behaved normally. I was curious why the car had altitude sickness, but didn't give it much thought as the problem ended at 4,000 feet. Now it is happening at sea level. I am getting a code of P0221 along with the BAS/ESP light and zero throttle response. Restarting solves the problem temporarily. I have refined the conditions for the error: 25-45 mph and partial to no throttle pedal. It seems to happen more readily when the engine is warm. I have a recent oem replacement of the TPS, the brake light switch is fine. Can this be a MAF sensor in the throttle circuit? I'm trying to figure out what component in the system would behave differently in the thin air/low pressure high altitude vs. thicker/higher at sea level ... then deteriorate to malfunction at sea level too. The only suspect I can think of is the MAF. If so, what supplier of inserts have you seen supplying quality parts at low cost?

Your direction is appreciated.
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