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P1237 Diagnostic Trouble Code Discussion for July 2014

Fuel Pump Secondary Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1237
Help Request Posted
2005 Nissan Frontier XE 2.5L Poor Fuel Economy, MIL Lamp on VIN: 1N6BD06T65
P1237: A/F sensor 1 fail. Hi everyone :). I got this fault code P1273 for A/F sensor 1 from my 2005 frontier with 165,000 miles, since it is 4 cyl I replace the A/F sensor at the front then couple hundred miles it come back a gain with the same code, I replace the rear O2 sensor and Ex...
July 18, 2014