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2006 XS Forester
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Discussion Starter #1
Hi,
I have a 2006 Forester that is having an intermittent rough idle and no power on takeoff. The CEL code I got the first time was a P171 System too lean. I cleared this and about two days later the problem occurred again but this time the code was P172 System too rich. The codes don't come in at exactly the same time as the rough idle symptoms interestingly. I have pulled out the MAF sensor and it looks clean. My initial thoughts are that it is either the MAF sensor or the front O2 sensor. The car is duel Fuel (LPG/Petrol) and experiences the problem on both LPG and Petrol. Has anyone else experienced anything similiar or can shine any light on the probable cause ?
 
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