Question about 2007 Volvo S40 2.4i Sedan
Most lean O2 Sensor Codes are from vacuum leaks,
you should be able to find and fix yourself
For $50.00 & 15 minutes of your time,you better not
be paying someone to do an O2 Sensor
Posted on Apr 02, 2011
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Posted on Jan 02, 2017
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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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