1997 Other Nissan Models emissions and engine control system

  • 1997 NISSAN

Engine Performance problem
1997 Other Nissan Models 6 cyl Two Wheel Drive Automatic 144000 miles

Have a Nisson Quest showing PO135 fault which is "Upstream heated O2 heater fault". Both upstream and downstream oxygen sensors were replace, fault cleared, started engine and "check ' light returned. What now? Thanks.

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Saturday, September 6th, 2008 AT 8:54 AM

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