Oxygen Sensor and Engine Light

Discussion in 'Chevy C/K Truck Forum' started by Big_Mike, Jul 29, 2013.

  1. Big_Mike

    Big_Mike Member 100 Posts

    Ladies and gentlemen,

    I have a 93 Chevy pick up. 5.7 L engine. The engine light comes on sometimes (not always) but goes back out usually in a brief amount of time. Found out that it was an oxygen sensor that appeared to possibly be a touch lazy.

    I recently replaced the old oxygen sensor with the one currently equipped from the local dealership (engine light kept coming on and staying on with the old one). All wires and connections seem to be fine. I was curious if anyone knew if this is typical of these trucks or maybe I have another defective sensor?
  2. mfleetwood

    mfleetwood Epic Member 5+ Years ROTM Winner 5000 Posts

    Here are some instructions that may help you. Also, please note the last paragraph (bold, red font) which states that you need reset your computer once you fixed the problem. If you did not take that last step when replacing the sensor, that may be causing your problem of the light staying on.

    GM 1983-95 vehicles OBD1 codes self-retrieval
    As the name implies, you can get the codes for GM cars or trucks yourself if the model of your vehicle is made before 1995, this means as soon as you see “check engine light” in your dash, you can get the code in minutes if you want.Shown on the left is a picture of the connector pin terminals where you can get the GM OBD1 code.
    When you find this adapter connector (usually on the bottom left side of your dash panel) use a jumper wire or paper clip and connect terminals A and B. Next turn your key on but don't start. Watch your check engine flash the code/s.
    EXAMPLE: CODE 12: one long flash and two short flashes CODE 13: one long flash and 3 short flashes.
    Note: code 12 is usually the first code you get and just ignore it. Watch the code after code 12, that's what you need to fix.
    [​IMG]GM common codes for OBD1 (for vehicles made before 1995)
    12 System normal
    13 oxygen sensor circuit open
    14 coolant sensor high resistance or shorted
    15 coolant sensor circuit low or open
    16 direct ignition system (DIS) fault in circuit
    17 cam position sensor fault
    18 crank or cam sensor error
    19 crank sensor circuit fault
    21 tps sensor out of range
    22 tps sensor signal voltage low
    23 intake air temp sensor out of range, low
    24 vehicle speed (vss) sensor circuit fault
    25 air temp sensor sensor out of range, high
    26 quad-driver module (computer) circuit #1 fault
    27 quad-driver module (computer) 2nd gear circuit
    28 quad-driver module (computer) circuit #2 fault
    29 quad driver module (computer) 4th gear circuit
    31 cam position sensor fault
    32 egr circuit fault
    33 map sensor signal out of range, high
    34 map sensor signal out of range, low
    35 idle air control sensor circuit fault
    36 ignition system circuit error
    38 brake input circuit fault
    39 clutch input circuit fault
    41 cam sensor circuit fault, igntion control circuit fault
    42 electronic spark timing (EST) circuit grounded
    43 knock sensor
    or electronic spark control circuit fault
    44 oxygen sensor lean exhaust
    45 oxygen sensor rich exhaust
    46 pass-key II circuit or ps.pressure switch circuit fault
    47 pcm-bcm data circuit
    48 misfire diagnosis
    51 calibration error, mem-cal, ecm or eeprom failure
    52 engine oil temperature circuit, low temperature indicated
    53 battery voltage error or egr or pass-key II circuit
    54 egr system failure or fuel pump circuit low voltage
    55 a/d converter error or pcm not grounded or lean fuel or frounded reference voltage
    56 quad-driver module #2 circuit
    57 boost control problem
    58 vehicle anti-theft system fuel enable circuit
    61 a/c system performance or degraded oxygen sensor signal
    62 engine oil temperature high temperature indicated
    63 oxygen sensor right side circuit open or map sensor out of range
    64 oxygen sensor right side lean exhaust indicated
    65 oxygen sensor right side rich exhaust indicated
    66 a/c pressure sensor circuit low pressure
    67 a/c pressure sensor circuit or a/c clutch circuit failure
    68 a/c compressor relay circuit failure
    69 a/c clutch circuit head pressure high
    70 a/c refrigerant pressure circuit high
    71 a/c evaporator temperature sensor circuit low
    72 gear selector switch circuit
    73 a/c evaporator temperature circuit high
    75 digital egr #1 solenoid error
    76 digital egr #2 solenoid error
    77 digital egr #3 solenoid error
    79 vehicle speed sensor (vss) circuit signal high
    80 vehicle speed sensor (vss) circuit signal low
    81 brake input circuit fault
    82 ignition control (IC) 3X signal error
    85 prom error
    86 analog/digital ecm error
    87 eeprom error
    99 power management

    Please note that after getting any of these codes, you need to reset your vehicle engine computer code. You do that manually by disconnecting the battery negative terminal for 1 minute or two. Then reconnect. Once connected, start and warmed up the engine so you can get the fault code again. If the code that you get initially is the same that you are getting now, then it means that this latest code is a hard or true code that needs immediate attention.
  3. Big_Mike

    Big_Mike Member 100 Posts

    Thanks a lot, will check this out.

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