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Holden Commodore 2006: LPG problem

I bought a 2006 Holden VZ Crewman in 2010 and had LPG installed. For the past year my powertrain light keeps coming on and my mechanic said it's to do with the gas. The gas installer said it was the injectors and I had them done, they then said it must be the oxygen sensors but never got back to me. I then took it to another mechanic who said it was running lean and adjusted it. But the light still comes on. My mechanic says his machine says it's the LPG ECU, but the light comes on when running on gas or petrol. Neither my mechanic, or the gas man are able to confirm what it is, so I'm paying for their guesswork. Do you have any suggestions to what it could be, or whom I could take it to?

It's hard to suggest what might be wrong without seeing the car, so I suggest the best thing is to have an LPG specialist look at it. Give the people at Impco a call on 03 8788 1000 and ask them to check the car for you.

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