bxf Posted October 25, 2006 Share Posted October 25, 2006 I have a 2000 EX300. The car got a check engine/trac off light on problem recently. I took it to auto zone for reading the code. The code showed P0171 system too lean bank 1. The guy who did test for me told me that the problem is the defective O2 sensor. He also showed me the sensor which is just right in front of engine. I bought the Bosch universal O2 sensor from oxygensensorwholesale.com which costs me $68. The sensor looks exactly same as original one. It comes with 2 black wires, 1 blue wire and one white wire, and also comes with a kit for making connection with the old plug. After replaced new sensor I disconnected the battery for 10 minutes to reset the code. It seems to be fine when I restart the engine because check engine and trac off light went away. It is less than 12 hours. The check engine and trac off light comes back on again. I really don’t know what is going on now. :( Maybe I should buy OEM sensor? Maybe I replaced wrong sensor? Or maybe some problem else involved? I remember the reprehensive did mention me that there two O2 sensors before catalyst when I placed order. Should I replace both of them? I really need help to figure out the difficult. I appreciate any info. Thanks Quote Link to comment Share on other sites More sharing options...
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