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2005 sliverado 1/2 ton 5.3 4x4 02 heater circuit p0155 and p0161

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4 years 5 months ago #35190 by Duramaxlbz
2005 sliverado 1/2 ton 5.3 4x4 02 heater circuit p0155 and p0161 was created by Duramaxlbz
One side is rich and one lean anyone have a way yo test these ?
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4 years 5 months ago #35194 by Cheryl
Replied by Cheryl on topic 2005 sliverado 1/2 ton 5.3 4x4 02 heater circuit p0155 and p0161
Unhook oxygen sensors start out with a resistance meAsurment on the 2 wire colors that are the same. Let us know what you find. Should show continuity

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4 years 5 months ago #35231 by Tyler
Replied by Tyler on topic 2005 sliverado 1/2 ton 5.3 4x4 02 heater circuit p0155 and p0161
What are the fuel trims, exactly? Because the O2 codes are for heaters, I'd suggest diagnosing the P0166 and P0161 separately from the P0300

In the scan data, what's the current reading for all four O2 heaters with the engine running?

In the misfire data list, what are the history miss counts?

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