P1B46 Diagnostic Trouble Code

P1B46 is a kind of OBD-II Diagnostic P-Powertrain 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 P1B46 diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code P1B46 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 P1B46.

Fortunately, P1B46 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1B46 Trouble Code For Specific Cars

P1B46 Mazda Mazda 6 Turbocharger Boost Sensor A Circuit High
P1B46 Daewoo Kalos Gate Select Actuator Circuit High
P1B46 Ford Excursion Memory 1 Switch Circuit Failure
P1B46 Toyota Avalon Ii O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
P1B46 Maserati Biturbo Transmission Fluid Pressure Sensor/Switch C Circuit High
P1B46 Bugatti Type 64 Cylinder 2 Contribution/Balance Fault
P1B46 Chrysler Ccv Engine Overtemp Condition