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Are you having problems with the engine of your Mazda 121? Let our team of motoring experts keep you up to date with all of the latest Mazda 121 engine issues & faults. We have answered all of the most frequently asked questions relating to problems with the Mazda 121 engine.
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IT SOUNDS as if the engine is running too rich, which could be caused by a faulty oxygen sensor in the exhaust. It's there to monitor the air-fuel mixture and send signals back to the engine-management computer. If it's faulty it could be sending the wrong message.
IT'S at the high end of what I would expect, but it's hard to provide a reason without knowing if you live in a hilly area, if you keep tyre pressures up to the correct level, if the wheel alignment is within spec, and if the engine is in good condition.