Po420 Code Subaru

2000 forrester 150,000 miles regularly serviced. we had a po420 code ('09-'13) P0031 code: ho2s heater control circuit low (bank 1 sensor 1)

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2000 Forrester 150,000 miles regularly serviced. We had a PO420 code

2009 subaru forester x (alberta, canada). 143k (km). i went for an oil

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2000 forrester 150,000 miles regularly serviced. we had a po420 code2000 forrester 150,000 miles regularly serviced. we had a po420 code Po420 bank code.