P312A Bentley S2 Diagnostic Trouble Code
P312A Bentley S2 code definition:
P312A is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code for Bentley S2.
P312A Bentley S2 is described as Oxygen Sensor Circuit No Activity Detected (Bank 1, Sensor 1). This means there's a problem in the front oxygen sensor on Bank 1, as the O2 sensor is inactive. The spark should have a light tan color. If the sensor probe comes with white and chalky parts, this means it has been lagging between switching phases, and should be replaced.
Symptoms
Symptoms of a P312A Bentley S2 diagnostic trouble code may include:
- Poor acceleration
- Cherry red hot catalytic converter
- Possible spark knock (detonation / pre-ignition)
- The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
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Possible Causes :
- Defective ECU strategies or components will prevent proper regeneration
- The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
- A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
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Common Misdiagnoses
- Exhaust Gas Recirculation System Valve 1 Problem
- BBV Sensor Circuit Low Voltage Problem
- Transmission Engaged At High Throttle Angle Problem
- Cruise Inhibit Control Circuit Problem
- TFP Valve Position Switch-Drive Without Drive Ratio Problem
Repair Processes :
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.
It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.
Process Tips
Diagnostic trouble code P312A Bentley S2 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 P312A Bentley S2.
Fortunately, P312A Bentley S2 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
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