I changed 3 O2 Sensors on my 2006 Toyota Avalon bur, the check engine light is still on. Had someone use a OBDII to clear the codes. The light went off for a minute then, back on, what should I do?


Asked by Nov 02, 2015 at 09:57 AM about the 2006 Toyota Avalon Touring

Question type: Maintenance & Repair

I changed the A/F sensor at the top of the manifold and the 2 O2 sensors right below there by down by the radiator but, my check engine light came back on after about a minute, what should I do?

5 Answers

Tom Harmon

First you sould be aware that all the O2 sensors do is make you aware that you have a problem, Changing the O2 sensors does not cure the problem .. in fact ,, it's only confirming that the problem is still there. A Good On Board Diagnostic will tell you the sensor that's triggering the alarm ... by knowing what sensor is sending the alarm ,,you can determine the problem . If it's before the catalytic converter it's an engine issue ,,if it's after then it's a converter issue


The Codes were P2195 and P0031

Tom Harmon

Toyota Service Bulletin P2195 - Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1) P0031 Oxygen (A/F)Sensor Heater Control Low (Bank 1 Sensor 1) ~~https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CCQQFjABahUKEwjm_rKmkPLIAhXK7yYKHYthCDA&url=http%3A%2F%2Fww2.justanswer.com%2Fuploads%2Fsnd27613%2F2008-10-22_002248_p0171.pdf&usg=AFQjCNGQyylbMcov76ps6XPs8h2g5PmZxQ&sig2=hq4wltUmhiMFT57Yz3yywQ&bvm=bv.106379543,d.eWE&cad=rjt


So, disconnecting the battery will not help? There were some people on here that stated, disconnecting the battery helped clear the codes after changing the O2 sensors and they have been fine sense then.

Tom Harmon

I sent you a Service Builtin Dude (RECALL) I don't know if you like that answer but that's as good as it gets

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