Question about 2002 Toyota Highlander

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Engine code 1135

O2 sensor has be replaced twice think i got a bad one . code come back within 2 minute . where do i look next

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  • trob24 Sep 01, 2008

    Hi Acorn



    How many oxygen sensors are there?



    I believe that I'm experiencing the same problem and should replace. Is it easy to do on your own? Are they easy to get to? Do I need any special tools? From the other response, I'll need a code reader after finishing it up. Thankfully, I know a shop that can clear the warning light, and with your help, I'm looking forward to saving some $$$ to afford gas. Don't forget to vote this year.

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I think this could be the code I had on my '96 when I bought it. I tried replacing the secondary O2 sensor, and long story short it was the ECU. Luckily my '96 was still under the extended emmissions warranty, so Honda replaced it for free. I don't think you would be covered under the extended warranty because it was 14 years and under 150k miles. I just barely made it (within a month or 2 and 3k miles) last year.

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Code 125 means the engine is not reaching operating temp which is needed to put the system into closed loop. Closed loop means the ECM is looking at all of the sensor readings to determine fuel trim level instead of using pre-set values. On cars built in the late 1990s closed loop is supposed to happen within a few minutes of start-up to cut down on emissions.
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