I've just bought a W Reg 25 diesel which has poor performance and is only doing around 28 mpg. I suspected the MAF and run the engine with it disconnected and performance seemed to improve slightly. Interestingly the engine malfunction warning light (next to the SRS light) never illuminates! I've checked the bulb and that's OK. I thought that running the engine with the MAF disconnected would have shown up as a fault and the light would have come on.
Any one got any ideas?
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