Question about 2004 Subaru Forester

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2001 forester 2.0 turbo s problem is hesitation when hard accelerating and intermittent poor idling.High emission CO output when warm = 5 or 6.0.Spark plugs replaced,lambda sensor also.cataclean used.Next would be engine coolant sensor. no fault codes found when diagnosed and no warning lights on. Anyone any ideas please?

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Normally what I would say is: Yes, shot gun a coolant sensor into it as they are relatively cheap and it would narrow down your options. Next I would say look at the MAF or airflow sensor, whichever it has. However, I just did a quick search through Alldata, and it says that there is a recall for the PCM because it needs to be re-programmed to read the O2 sensor correctly. Also there are a couple service bulletins relating to updated O2 sensors. The very first thing I'd do is check to make sure that the PCM has be reprogrammed. This was a recall and should have been done for free.

Posted on Feb 02, 2010

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