Sunday, September 03, 2006

P0172 code from 2000 Lexus RX 300 with 3.0L engine


The check engine light in the dash is always on and a code of P0172-bank1 running rich was taken from the scanner. The oxygen sensor tested OK and there are no signs of vacuum leak when I tested it. I am now tempted to remove the engine top plenum so I can test the injectors and ignition coils. Before I do this, is there a common fix for this code?

ATS Advisor:

Whether your engine is running rich or lean, almost 95% of this engine code comes from contaminated mass sensor. Take it out and service the wire elements. This sensor usually goes in this vehicle especially if the air filter is not serviced regularly. If possible, replace the sensor and reset the code. ATS provides instructions in servicing the mass sensor including the wiring diagram.


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