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2002 impreza p0328 & p0420 help !!
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Old 25 Apr 2011, 11:12 AM   #1 (permalink)
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2002 impreza p0328 & p0420 help !!

non turbo impreza engine codes p0328 & p0420 i know what they mean knock sensor and cat problem ...................i think the cat problem is causing the knock have replaced both o2 sensors and knock sensor ........when engine light is off car drives faster more responsive sounds better light comes on its sluggish sound rough any advice would be appreciated
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Old 25 Apr 2011, 03:03 PM   #2 (permalink)
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Re: 2002 impreza p0328 & p0420 help !!

Have you reset the ECU after changing the O2 sensors and knock sensor? By the way, its not always just a case of changing items that cause a CEL. The codes come up as a result of other things going wrong too. ie, there was probably not much point in wasting money changing the rear O2 sensor as that generally wont affect the running of the car and fault code P0420 refers to bank 1 which is just the front O2 sensor. Check all the basics first like plugs, coil packs, fuel filters, etc before embarking on spending loads. I learnt the hard way by spending loads first then finding out my problem was something simple!!
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Old 25 Apr 2011, 03:10 PM   #3 (permalink)
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Re: 2002 impreza p0328 & p0420 help !!

yh mate all coil packs filters everything its been to a few garages now know one seems 2 know or give a shit 2 be honest. ECU as been reset every time comes back on starting to loose faith now .......feel a r-evolution coming on !
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