Most computer systems will also monitor the current flow to the sensor. One of the technicians brought up an interesting question: With the control wire being shorted to ground, why did the computer set a code for an open heater circuit? Enter the 5 character trouble codes in the search box and submit the search. Once you determine that the fuse is okay, check for voltage at the O 2 sensor harness connection. Some rely on a radiator shutter mechanism to block airflow across the radiator to reduce heat loss on the engine coolant. Pay particular attention to the routing of wiring, since unsecured wiring can burn against hot exhaust components.
P0157 O2 Sensor Circuit Low Voltage Bank 2 Sensor 2 Short in wiring between sensor ground and signal wire. Oxygen sensor heaters Some cars have two banks of oxygen sensors. In order for any engine to work at peak efficiency, it requires an air to fuel ratio that allows all of the fuel in the mixture to be combusted without any excess air remaining after the combustion process is complete, or with additional air required to complete the combustion process. Replacement sensor installed with incorrect heater current values. Some computer systems will shut the O 2 heater circuit off until the codes are cleared. With the wire being grounded, the O 2 sensor heater circuit came on as soon as the ignition switch was turned on. The car will still be drivable while the error is being triggered, but you should look to have it diagnosed and repaired as soon as possible.
So the temperature start increasing. Replacement sensor installed with incorrect heater current values. Catastrophic failure of sensor due to thermal shock. Sensor heater broken or circuit shorted. P0140 O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2 Short in wiring between sensor ground and signal wire.
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The faster the air-fuel ratio sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module. P0143 O2 Circuit Low Voltage Bank 1 Sensor 3 Short in wiring between sensor ground and signal wire. A local shop called me in on just such a case. Shops are reporting a very high failure rate for this item due to poor design in the plastic housing. P0164 O2 Sensor Circuit High Voltage Bank 2 Sensor 3 Short in wiring between heater circuit and signal wire. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes.
The driver is equipped with a feedback circuit that is pulled-up to a voltage. This information can be valuable in identifying intermittent faults. P0137 O2 Sensor Circuit Malfunction Bank 1 Sensor 2 Short in wiring between sensor ground and signal wire. Then reconnect the battery and turn the ignition switch back on. If it still occurs, the steps for repair include: A full inspection of the wiring and connectors for any signs of wear or heat damage should be carried out. Silicone or ethylene glycol poisoning of the air reference electrode.
Why use a heated thermostat? Catastrophic failure of sensor due to thermal shock. Replacement sensor installed with incorrect heater current values. If other codes relating lean running, or misfiring conditions are present long with code P0031, repair these issues first before attempting an electrical diagnosis of this code. Common Symptoms The primary symptom will be the activation of the Check Engine light. The vehicle will continue in this failsafe mode until the issue is resolved. But that can also impair engine cooling once the driver takes off from idle. What are the symptoms of code P0031? Reference voltages should always closely match battery voltage; about 12.
In most cases, that resistance level must fall below 0. It could also be a case of bad ground or failed 12V battery input or connector. The light should remain off until the engine is started. In many cases, the cause of this issue is linked to problems with the wiring, as the heat from the catalytic converter and the exhaust can cause some damage. In some cases, oxygen sensor codes are thrown when there really is a problem somewhere else.
Sensor heater broken or circuit shorted. Replacement sensor installed with incorrect heater current values. How does a mechanic diagnose the P0037 code? Replacement sensor installed with incorrect heater current values. Does my car have more than one 02 sensor? These metals will expand or contract at different rates when heated or cooled. P0170 Fuel Trim Malfunction Bank 1 Vacuum Leak. In these designs, there is no fuse incorporated into the circuit. The worst-case scenario at this point would be a blown computer driver.
Check for corrosion or coolant infiltration, bent pins. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Essentially this P0031 Nissan code means that the resistance of the heater circuit is lower than normal. Heater On Off Temperature Control using Bimetallic Switch. Plus, they contain full trouble code descriptions and troubleshooting instructions.