Question about 2003 GMC Yukon
You have to replace the oxygen sensors, the engine computer adjusts the fuel/air mixture by reading the sensors...right now your engine is probably running very rich, which wastes a lot of fuel, and can also cause premature oil breakdown. O2 sensors usually require a special wrench to remove, so try a reliable local mechanic...
Posted on Jun 07, 2008
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Posted on Jan 02, 2017
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