what is: Oxygen sensor

Thursday, June 21, 2012

2003 Chrysler Town & Country: OBD Code P0171?

Check engine light code P0171.
This code says p0171 fuel system lean, bank 1 sensor 1.

The Sensor has to be replaced.

The most probable reason for this trouble code is a faulty oxygen sensor.
But before directly replacing O2 sensor i recommend to make sure there is no vacuum leak and also check wiring to the B1S1 O2 sensor.If all this checked ok,then replace the sensor.
Make sure to use a genuine Mopar oxygen sensor as I have seen too many troubles with aftermarket O2 sensors .Use quality parts and branded parts.

For you help:------
Bank 1 is the rear bank, closer to the firewall
Sensor 1 is the upstream O2 sensor ( in the exhaust manifold), that is before catalytic converter.

This details will help.
Thanks.

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Wednesday, May 2, 2012

2003 Toyota RAV4: Engine Codes P0141 & P1155?

Both this error codes are related to Heater Element.

Proper inspection is required.

The P0141 code means that the heater element in the oxygen sensor bank one sensor two or B1 S2 has failed. This in itself will not cause an igniter problem Or a performance problem. Code P1155 means that the heater element in the AFR sensor or air fuel ratio sensor for bank two sensor one has failed. This is identified as B2 S1. This also will not cause an issue with performance or the igniter problem. In most of cases it ends up just being a bad sensor. Make sure that you replaced the correct sensors.

This details will help.
Thanks.