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2000 Nissan Altima Question: code readers



ctrrhino, Las Vegas, NV, January 16, 2010, 07:34

I used a diagnostic code reader and came up with two codes, P1126 and P0138, can you tell me what stand for?

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  • Answer #1

    January 16, 2010, 14:03

    The trouble code data is listed below. I would start by replacing the engine coolant thermostat, and checking the O2 sensor heater element for the sensor listed. (Front Sensor, Bank 2)
    Trouble Code Conditions:
    DTC P0115 not set, engine started, IAT sensor more than 14°F and ECT sensor from 14-149°F at engine startup, engine runtime over 10 minutes, and the PCM detected that the engine temperature did not reach at least 176°F under these conditions.
    Possible Causes:
    * Inspect for low coolant level
    * Inspect for incorrect coolant mixture
    * Check the operation of the thermostat (it may be stuck open)

    Trouble Code: P0138 2.4L L4
    HO2S-12 (Bank 1 Sensor 2) Circuit High Input (Rich Shift)
    Trouble Code Conditions:
    Engine started, vehicle driven to a speed over 20 mph for 1 minute, IAT sensor from 14-122°F, fuel level over 25%, and the PCM detected the HO2S signal did not reach the maximum voltage level of 0.60v, or the signal remained at more than 600 mv in the test.
    Possible Causes:
    * Fuel pressure regulator leaking or fuel injectors leaking
    * HO2S may be contaminated or it has failed
    * HO2S heater is damaged or has failed
    * PCM has failed
    * TSB 01-016 (9/01) contains information related to this code

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