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Why does the engine light keep coming on in my 2008 Holden Colorado?

Asked by Colin

The engine light keeps coming on in my 2008 Holden Colorado. The mechanic said it's the 02 sensor on the upper driver’s side and I had it replaced, but still have the same issue/same sensor. What could the matter be?

Answered by CarsGuide

24 Jun 2021 David Morley

If replacing the actual sensor doesn’t fix the problem, then you could be looking at a problem with the wiring that connects that oxygen sensor to the car’s on-board computer. Did the mechanic that changed the sensor check the condition of the wiring? This equipment all lives very close to a very hot exhaust system, so damage from that is not unknown.

There’s also a chance that the computer itself is throwing up a bogus fault code when it’s interrogated. Temporarily swapping the computer for another one is a reasonably simple way to rule this out. There’s also a chance (and it’s more common than you might imagine) that the brand new oxygen sensor you had fitted was a dud straight out of the box. This has definitely been known to happen, and it’s the first thing some experienced mechanics will think to check.

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