Mastering Engine Code P0171 The Key to Optimal Engine Function

This is one of the most common trouble codes in V-6 and larger engines. P0171 is a "System Too Lean (Bank 1)," which is triggered by the first exhaust ... The most common cause that we see at the dealer is a MAF sensor, especially if you have a K&N or other oiled air filter. O2 sensors can also ... The reading is too lean (i.e. too much air or not enough fuel). P0171 is a bank one reading lean, P0172 is for bank two reading lean. If the PCM is saying is ... Your problem is more than likely an air leak. That code means you are running lean period. There is only one bank...so disregard the idea of a bank two. It could be lean under high load/demand conditions and fine at low load. Mixture lean/rich codes can't set until the O2 sensors are active and ... P0171 is a code indicating that the engine is experiencing a leaner fuel mixture than what's commanded (too much air or not enough gasoline). A trouble code P0171 or P0174 means the oxygen sensor or Air-Fuel Ratio (AFR) sensor (in bank 1 [P0171] or bank 2 [P0174]) has detected a lean ... What is the cost to resolve a P0171 code? ... This code will require a diagnostic check, which will run about $100 depending on the time it takes to find the ... More often than not P0100, P0110 and P0171 are related to the MAF being dirty or worst case damaged. Normally you start with the lower codes ... B5 Models - Check Engine Code P0171 Bank 1 System Too Lean - I recently got a check engine light on my 2001 A4 Quattro with about 130K miles ...