Question about 2002 GMC Yukon Denali
They are all located in your exhaust system you have bank1 and bank 2 sensors 1 and 2 with a (4) oxygen sensor system. They are pretty simple to replace they kinda look like spark plugs screwed into the exhaust sytem with wire attached to them with a plug at the ends of the wires, usually the wire are colored white grey and black .Approximately 4 thin wires on each sensor. Easy to find start from the top of the engine and follow the manifolds downwards toward the tail pipe/pipes. There will be two on either side of the manifold before the converters and 2 after the converters. All you need is an oxygen sensor socket and A ratchet. The socket had a slot that allow you ro put over the sensors and wires or there is a "crow foot" type looks like a Brake line wrench work well too. You may need some liquid wrench/.WD40 maybe rusted a little bit. Counter clockwise to loosen and clockwise to install. Good Luck hope that I Fixed ya. Get back in contact if you need more help
Posted on Dec 16, 2008
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Posted on Jan 02, 2017
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