On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. What does lean Bank 1 on Mazda mean?īasically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). Your mechanic can check for vacuum leaks and test the mass airflow sensor with a scan tool. Q: What could cause the code P0171 on 2002 Toyota Corolla? A: In the 2002 Corolla, the code P0171 is often caused by a bad or dirty mass airflow sensor or vacuum leaks. What causes the code p0171 on 2002 Toyota Corolla? If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the P0171 is combined with the P0174 code, it’s very likely that the problem is caused by an intake leak. What to do if your air filter is p0171?Ĭheck for damaged components and look for broken, bent, pushed out, or corroded connector’s pins. The OBDII trouble code P0171 – System Too Lean (Bank 1) means that the engine air-fuel mixture is too lean, or there is too much air and too little fuel. Code P0171 – System Too Lean: Symptoms, causes, common problems, diagnostic.
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