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PO303 and PO316 codes

Discussion in 'Ford Ranger - Mazda B-Series Forum' started by Moranstan, October 11, 2017.

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    1. Moranstan

      Moranstan New Member

      October 11, 2017
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      City, State:
      Moran, Texas
      Year, Model & Trim Level:
      2005 Ranger STX
      2005 Ranger 3.0 STX

      My check engine light comes on if I let it idle with the A/C on. PO303 and PO316
      I replaced plug wires, plugs, coil pack, #3 injector, fuel filter and pump unit and checked injector wiring with noid lights, I also bought the kit to clean MAF sensor and throttle body.
      I really thought the pump replacement had fixed it because it starts easier but I drove it 30 miles after replacing the fuel pump and filter and stopped and let it idle with the A/C on and the check engine light came on. It runs great on the highway but it has a somewhat rough idle.
      What do I replace now? O2 sensors??
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