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Discussion Starter · #1 ·
does anyone know what would cause the pcm to throw a P1133?? i read with a scan tool and it says o2b1 too slow or insufficent switching. thanks
 

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1133 monitors the front O2 sensor for 100 seconds and counts the number of times it crosses the rich to lean and lean to rich thresholds. If it does not switch enough times, 1133 is set. lean is less than 300 mv and rich is greater than 600 mv. Sounds like you have a bad connection or a bad sensor.
 

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Discussion Starter · #3 ·
thanks for the info. i changed o2 sensor and reset code then it came on again after a day. so i reset it again and now all is fine for now. 4 days later still no code.
 

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The most common cause of this code is when the sensor actually gets 'lazy' - usually from running leaded fuel or spilling engine coolant in the exhaust pipe. It can also show up if you lay your oxygen sensor wire on your header and it burns through.

The solution is a new oxygen sensor, then clear the DTC.
 
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