Help with a 99 Yukon

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Graham Cole

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Feb 28, 2016
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ontario canada
hey guys! I was wondering if I could get some guidance of what to start with to get the check engine light off on my 99 Yukon 5.7. It has these codes on po135, po157,po300, and Po404
Any help would be much appreciated!!
 
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rsparhawk

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P0135 and P0157 are o2 sensor codes, different ones at that also. May just be bad o2 sensors, could be wiring.

P0300 and P0404 may be related. Try blocking off your EGR, or at least pulling it and seeing if it looks like it is stuck open and maybe cleaning it if it looks real bad.
 
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