Question about Cars & Trucks
If you have a trouble code for one of the two O2 sensors, either the sensor could be bad, or the wiring to the sensor could be broken or shorted. The O2 sensor is used for calculating the air to fuel ratio, so if it goes bad, the engine will not run right.
Posted on Apr 28, 2013
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Posted on Jan 02, 2017
SOURCE: Upstream O2 sensor location?
That is the first sensor closest to the engine. The downstream sensor is the one behind the converter.
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Posted on Aug 31, 2008
It's under the hood, on the driver's side, under a square, black box with a lightning symbol on it. Loosen the flower-shaped screw that holds the lid of the box down, remove the lid, flip it upside down and when you look at the inside of the lid, you'll see a map of all your car's fuses. There's also a fuse diagram on the very end of the dash, but it's accessible only when you open the driver's side door. When you're driving, that end of the dash is blocked by the closed door.
Posted on Jul 01, 2009
spark plug gaps are very critical on computerised cars!! [some wont even start!]
distributor module may be breeaking down as temp rises they fail!
otherwise do compression check as it may have valve problems
also check plug leads & injectors aswell as the fuel pump pressure [ could bestarving for fuel]
Posted on Jul 18, 2009
Inspect the O2 sensor after the Catalytic converter, make sure the lead wires are good and not damaged from corrosion and heat. If all wire leads seem to be good, replace the O2 sensor and try to stay away from after market sensors. They don't last long and as for your Catalytic Converter, you can check it by bang in on it to see if there are any rattles coming form the inside.
The good news about a bad Catalytic Converter is that Gm covers them under warranty for up to 8 years.
Thank you for using fixya and good luck
Posted on Jun 09, 2010
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