P07C4 Pontiac Tempest OBD Code

OBD/2 P07C4 error code description and symptoms.

HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw.
The test fails when current draw exceeds a calibrated limit and/or an open or short is detected. Short to VPWR in harness or HO2S. Water in harness connector. Open VPWR circuit. Open GND circuit. Low battery voltage. Corrosion or poor mating terminals and wiring Damaged HO2S heater. Damaged PCM.

At this point we are assuming that the fuses and relays are good. You will need to locate the PCM/TCM and the power input signal circuit using your vehicle information source. Unplug the connector from the PCM/TCM, place the ignition switch in the ON position, and probe the appropriate circuit with the positive test lead of the DVOM.

P07C4 Pontiac Tempest Error Code Repair Process :

If your vehicle failed a P07C4 test and the P07C4 Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses wiper hi/low speed relay coil circuit short to ground a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look wiper hi/low speed relay coil circuit short to ground: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature.

Common Causes of Pontiac Tempest P07C4 OBD2 Code

A common cause of code P07C4 is the failure of Wiper Hi/Low Speed Relay Coil Circuit Short To Ground, but there are several other possible causes as well, such as ;

Exhaust tube
Continuous oil flow to the VCT piston chamber
1Camshaft Position Sensor circuit poor electrical connection
Ignition coils harness is open or shorted

P07C4 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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P07C4 Pontiac Tempest OBD Code

P07C4 Pontiac Tempest Error Code Repair Process :

Common Causes of Pontiac Tempest P07C4 OBD2 Code

P07C4 code for other Pontiac cars