Question about 2002 Nissan Altima
my car engine malfunction light vcabe on the code is reading PO171 system too lean bank 1 .could anyone please tell me what this means thanks
I think its the oxygen sensor (pre cat) in exhaust
Posted on Sep 23, 2008
Yeah i have the same problem with my prelude when i put straight pipe exhaust. They said its the OXYGEN SENSOR. if you have the same exhaust pipe, i would recommend putting the catalytic converter back. And reconnect the oxygen sensor.
Posted on Jan 29, 2009
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Nov 08, 2012 | 2004 Suzuki Verona
PO171 OBD2 Code basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes.
his code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code.
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