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Hello Gannon. If the knock sensor was faulty, could that explain why the fuel mix is running rich? Soon after I noticed the increase in fuel consumption, the ECU check light came on occasionally just after starting the engine. However, after a few weeks went by, the warning disappeared altogether, s...

Thanks to everyone who replied to my post. Except for the cat converter and temp sensors, I've tried all your suggestions. I think if a temp sensor was faulty, it would affect performance as well as fuel efficiency, but I might try a swap anyway.

Many months ago, I noticed a step up in fuel consumption, from about 10.5L/100km (typical) to about 12L/100km. Since then, it has been getting progressively worse. The car is now using over 13L/100km. It got new plugs and a new O2 sensor fitted recently, but problem remains. Any other suggestions on...