Hello Guys;
2004 MDX. with 133123 miles
MIL on with;
DTC P0171: Rear Bank (Bank 1) Fuel System Too Lean
DTC P0174: Front Bank (Bank 2) Fuel System Too Lean
Replace Both front & rear air fuel sensor and clean pcv valve.
MIL still on; after 4-5 days.
Any Help? Thanks

 

Do you have a K&N air filter? Those codes refer to the MAF sensor. Its either dirty or malfunctioning. Or possibly a vaccuum leak downstream of MAF. There was no need to replace the A/F sensors, all they did was detect the lean condition because of bad MAF reading.

 

Could be injectors. You need to look at fuel trims on an OD2 scanner.

 

u said MIL STILL on do u mean u didn't reset it ??
if not it takes 40 key cycle to turn it off IF the problem is fixed disconnect the battery