Posted by Steve@Advance on January 04, 2014 at 20:31:33 from (107.203.134.67):
In Reply to: O2 sensor posted by Chris Jones on January 04, 2014 at 13:29:36:
My 01 Silverado 4.8 had cold weather check engine light for years. Turned out to be vacuum leaks under the intake. The dealer had the heads off under warranty, looked like the reused the gaskets.
Any "unmetered" air, as in air that didn't pass by the MAF sensor will cause the mixture to lean beyond the ability of the O2 sensor to read, and will set the 161 code. The problem is intensified by cold dense air requiring more fuel to meet the proper a/f ratio.
Check for vacuum leaks, crankcase air leaks, plenum leaks... The light will clear itself once the mixture gets back in range.
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