Originally Posted by newschoolpickup
I recently took my truck(97' ranger) to a hardware parts store and had a friend there run his diognostic code reader. it came up with this P0171- which means that there is to much air in (bank 1) and i also got P0174(bank 2) which is basically the oposite side with the same problem. I have just did a small amount of searching and some people are saying they clean the MAF sensor. does that work? and when it says bank 1 and 2 what sensor is it talking about. Thanks matt
Bank 1 = passenger side
Bank 2 = driver side
The two O2 sensors that are being read for these codes are the ones closest to the engine on each of the two banks.
Here are a few general possibilties for lean codes P0171/P0174. I'd rank them like this with most likely at the top of the list and least likely at the bottom:
- Vacuum leak
- Leak between MAF sensor and throttle body
- Dirty MAF sensor
- Dirty injectors
- Low fuel pressure.
- Bad oxygen sensors
These codes are not caused by an ignition problem. At high miles, it may well be time to replace the plugs/wires but that is a separate issue.
BTW, please remember to include the year/model/engine/transmission/mods/etc. when asking any technical questions. Sometimes there are known problems that are specific to a particular combination.