U0442 Trouble Code

OBD/2 U0442 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.

As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.

Difficulty Level (Soso)
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Repair Time (30 Min.)
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Cost Prediction : $ 80-120

U0442 Error Code Repair Process :

If your secondary air injection system switching valve a circuit shorted check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system U0442 and engine control unit are in charge of monitoring a bunch of different secondary air injection system switching valve a circuit shorted, and if they get a reading that's a little out of whack, up pops the check engine light.

Wrench Tool U0442 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

Common Causes of U0442

A common cause of code U0442 is the failure of Secondary Air Injection System Switching Valve A Circuit Shorted, but there are several other possible causes as well, such as ;

U0442 code for all cars

You can view according U0442 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+U0442 Peugeot 504 +U0442 UMM Alter +U0442 Ferrari 246 +U0442 Maybach SW +U0442 Lotec C1000
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