P0135 How do I fix? - MustangForums.com

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P0135 How do I fix?

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Old 05-03-2009, 06:01 PM
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adam0421
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Default P0135 How do I fix?

P0135 Upstream Heated Oxygen Sensor Heater circuit fault - Bank No. 1.

Just installed Kooks LT's and off-road H. Got a new tune from bama.

About 5 minutes after I started it I got the CEL with this code.

If its a problem with the tune would I get another code for the other o2 sensor?

The exhaust smells rich and it runs a little ruff when slowly accelerating, but it seems fine at WOT

Thanks,

Adam
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Old 05-03-2009, 07:31 PM
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jahudso2
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Did you install the headers, or did you have someone else do them? Are you sure you connected the electrical connections for both 02 sensors? Did you accidentally use a rear 02 sensor in the place of a front one? Make sure the 2 02 sensors you have left over are the same color. I think the upstreams are green and the downstreams are blue... but i may have those mixed up.
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Old 05-03-2009, 10:46 PM
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adam0421
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Ya I installed the headers myself. I am positive everything is connected. 2 green o2 up front and 2 blue in the back
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