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why did it take 70 miles of driving dor ck eng lt to come on
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asked
Aug 7, 2018
by
anonymous
the cat was replaced all 4 o2 were replaced ck eng light came on after 20 min. so replaced the 2 front o2 sensors again after air fuel trim test. drove 70 miles and light is back on with po 1133 and 1135 codes where to go from here
Vehicle:
2008 gmc yukon denalli 6.2
po
1133
1135
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Aug 9, 2018
by
Reynaldo
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Slow response from the front 02 sensor, GMC 02 sensor goes to slow response if there was a misfire condition, or a MAF sensor that is reporting incorrect incoming air, Try a MAF cleaning only and clear the code , clear the code regardless if there is a CK ENG LT on by doing a code clearing regardless if the CK ENG LT is on this causes a resistance relearn of the H02S resistance.
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