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Codes P0171 and P0174

Old 07-21-2012, 02:24 PM
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Join Date: Feb 2009
Posts: 35
Default Codes P0171 and P0174

Have both codes 0171 and 0174 both systems 1 and 2 too lean banks 1 and 2. Car is a 2001 2.9l non turbo with 178K miles on it. original CAT converter and original sensors. Where do I start? I can replace the spark plugs, which were replaced about 25K miles ago. and I have a K&N air filter. Should I replace the spark plugs clean the K&N air filter and clean the MAF meter? does that make sense to start there?

What drives these codes to come up?

Old 08-05-2012, 08:29 PM
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Join Date: Feb 2009
Posts: 35
Default P0171 and P0174

I continue to chase this problem. I do have a K&N air filter that I cleaned. I also just took the MAF sensor out and cleaned it with a CRC MAF sensor spray cleaner. I did read that this could be a primary problem if the MAF sensor gets dirty from the K&N filter. Will report back on how this cleaning did. I cleared the codes and ran the car to reset the air fuel ratios. Will take several trips to see if the codes reappear.
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