dannc Posted March 10, 2009 Share Posted March 10, 2009 just recently i posted a problem with toy. siena and now i have a new one with my 03 corolla code is po135 '02 heather sensor malfunction' i change the 02sensor and reset the code and it works, but that is only for a while. after a couple of weeks the check eng. light is on again. what i did is grab my scan tool, scan it again and found out that i have the same trouble code. does this means that the o2 sensor that i got is defective? or i didnt solve the problem? thanks for looking danni This post has been edited by dannc: Today, 04:13 PM Quote Link to comment Share on other sites More sharing options...
Leighcm Posted March 10, 2009 Share Posted March 10, 2009 just recently i posted a problem with toy. siena and now i have a new one with my 03 corolla code is po135 '02 heather sensor malfunction' i change the 02sensor and reset the code and it works, but that is only for a while.after a couple of weeks the check eng. light is on again. what i did is grab my scan tool, scan it again and found out that i have the same trouble code. does this means that the o2 sensor that i got is defective? or i didnt solve the problem? thanks for looking danni This post has been edited by dannc: Today, 04:13 PM It might mean you didn't change the right O2 sensor. Quote Link to comment Share on other sites More sharing options...
dannc Posted March 10, 2009 Author Share Posted March 10, 2009 It might mean you didn't change the right O2 sensor. does this means that it might be the 2nd one by the cat? Quote Link to comment Share on other sites More sharing options...
Leighcm Posted March 10, 2009 Share Posted March 10, 2009 It could be. Quote Link to comment Share on other sites More sharing options...
XR2003 Posted March 11, 2009 Share Posted March 11, 2009 P0135 O2Sensor Heater Circuit Malfunction (Bank #1 Sensor #1) should be the O2 sensor nearest the engine. did you reset the computer after replacing the bad sensor? reset = disconnect negaive terminal from battery for about 10 minutes OR disconnect ECU fuse for about 10 minutes. Once reset the computer can read the sensor readings and adjust accordingly. Quote Link to comment Share on other sites More sharing options...
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