B0442 Diagnostic Trouble Code

B0442 is a kind of OBD-II Diagnostic B-Body Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a B0442 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.

Repair Processes :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.

Process Tips

Diagnostic trouble code B0442 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before B0442.

Fortunately, B0442 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0442 Trouble Code For Specific Cars

B0442 Gaz 24 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
B0442 Seat Ritmo Injector High Sides Shorted Together
B0442 American Limousine Air Suspension Height Sensor Power Circuit Open
B0442 Changhe Ideal Door Lock Cylinder Circuit Short To Battery
B0442 Wolseley 12
B0442 Mazda 110 Transmission Transfer Case Contact Plate 'A' Open Circuit
B0442 Rover City Ignition Coil G Primary/Secondary Circuit Malfunction