Question about 2002 GMC Yukon Denali

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Oxeygen sensors Where are the 4 oxegyn sensors locacted on my 2002 Yokon Denali and are they easy to replace?

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  • kwr2 Jan 18, 2009

    would sensor 1 bank 1 be on the y pipe just above the cat on the drivers side or would sensor 1 be higher up on the block just above the spark plug drivers side




  • jim sherman Feb 23, 2009

    same my codes come up as 171 and 131 changed plugs engine light still on . found out it could be sensors . truck has 76000 miles. first problem ive had though!!

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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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