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Automotive Science or Voodoo?
117 messages, Last post on Nov 19, 2012 at 8:45 AM
You are in the Maintenance & Repair Forum.- Your Host is mr_shiftright
What is this discussion about? Car Safety, Exterior, Fuel System, Performance Mods, Auto Body, Engine, Fuel System, Oil, Paint, Transmission, Alternative Fuels, Diesel, Hybrid Cars, Fuel Efficiency (MPG), Car Warranties, Coupe, Convertible, Hatchback, Truck, Sedan, Wagon, SUV, Van
#116 of 117 Re: Cavalier Diagnostics [smonday] by srs_49
Nov 19, 2012 (6:48 am)
Replying to: smonday (Jan 19, 2011 6:14 am)
I don't think the P0171 code means that the downstream O2 sensor is bad. Just that it's detecting an excess of oxygen on the exhaust flow. Which could be caused by a bad MAF sensor. All the rest of the codes could be a result of the excess oxygen in the exhaust.
- Mr_Shiftright (Nov 19, 2012 8:45 am)
Replies to this message:
#117 of 117 Re: Cavalier Diagnostics [srs_49] by Mr_Shiftright HOST
Nov 19, 2012 (8:45 am)
Replying to: srs_49 (Nov 19, 2012 6:48 am)
yep P0171 is tricky. Many a good 02 sensor has been replaced because of that code. MAF sensor is a good guess; also coolant temp. sensor can throw this code; perhaps even a vacuum or exhaust leak.
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