Quote:
Originally Posted by steamship
About the only other possibility to consider is a clogged catalytic converter due to collapse, or some other blockage in the exhaust system.
From what else I've read, if the o2 sensor(s) are on the way out, they may not throw up an error code, but could be providing false information that the engine is running lean, and hence feeding more fuel through it.
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Hi, the catalytic converter is something I'd considered. I'm not sure how that could be tested though. It passed MOT with no emissions problems last time around if that makes any difference. It did originally fail on emissions but after replacing both leaking flex pipes it passed (didn't know a leaking flex pipe could cause an emissions failure at the time as it's after the cat)
The pre-cat O2 sensors have just been changed (finished today) as that was the only thing left that I could of, but they don't seem to have shown any improvement. Post-cat sensors are still originals as far as I know.
Thanks