SES light :(

wstar · 10-24-2011, 03:22 PM

Yeah if you think you may have run over something, especially check the wiring and sensors for the rearmost pair of O2 sensors (behind the cats). They're pretty exposed, I'm not fond of the design there.

As far as the MAFs go, when they're dirty/oiled it can take a while to throw something like P0157. What triggers the code is that it's trying to use the MAF input to verify the response curve of the rear O2 sensor, and after a while of driving it ends up eventually blaming the rear O2 sensor's response curve when the MAF is actually the one at fault more commonly (assuming no damage under there).

xgrudgex · 10-24-2011, 03:30 PM

Quote:

Originally Posted by wstar

Yeah if you think you may have run over something, especially check the wiring and sensors for the rearmost pair of O2 sensors (behind the cats). They're pretty exposed, I'm not fond of the design there.

As far as the MAFs go, when they're dirty/oiled it can take a while to throw something like P0157. What triggers the code is that it's trying to use the MAF input to verify the response curve of the rear O2 sensor, and after a while of driving it ends up eventually blaming the rear O2 sensor's response curve when the MAF is actually the one at fault more commonly (assuming no damage under there).

Yea I honestly dont think I snagged anything while driving even tho it sounded like I ran over a flattened bird cage but I took a look at lunch to see if I could see something without lifting the car but NO DICE... cars to efin' low so that will have to wait...

As for the dirty/oiled MAF, about how long do you think it would take until it started blaming the o2? you think 5k miles long or more like a couple hundred before it started blaming the o2?

Im realllllly hoping it is the MAF... Ill buy some MAF cleaner today even if I find out I snagged something because the more I think about it I remember them drop in were pretty oiled... or its my imagination because thats what I want it to be! lol

wstar · 10-24-2011, 03:52 PM

Quote:

Originally Posted by xgrudgex

As for the dirty/oiled MAF, about how long do you think it would take until it started blaming the o2? you think 5k miles long or more like a couple hundred before it started blaming the o2?

No idea really, all depends on how quick the oil/dirt layer builds up, and how much it ends up affecting the sensor.

xgrudgex · 10-24-2011, 04:25 PM

Quote:

Originally Posted by wstar

No idea really, all depends on how quick the oil/dirt layer builds up, and how much it ends up affecting the sensor.

Figured that much but hoping I was going to get a magic answer lmao!

10-24-2011, 03:22 PM	#1 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3595	Yeah if you think you may have run over something, especially check the wiring and sensors for the rearmost pair of O2 sensors (behind the cats). They're pretty exposed, I'm not fond of the design there. As far as the MAFs go, when they're dirty/oiled it can take a while to throw something like P0157. What triggers the code is that it's trying to use the MAF input to verify the response curve of the rear O2 sensor, and after a while of driving it ends up eventually blaming the rear O2 sensor's response curve when the MAF is actually the one at fault more commonly (assuming no damage under there). __________________ 7AT Track Car! Journal thread / Car setup details

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