P1B21 Mastretta Mxt Diagnostic Trouble Code
P1B21 Mastretta Mxt code definition:
P1B21 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code for Mastretta Mxt.
P1B21 Mastretta Mxt shows up when there's an electrical problem that causes the fuel volume regulator to malfunction and open. It's quite an unusual problem and likely intermittent. Other symptoms that may indicate this problem are when the Check Engine Light illuminates and when there is a visible lack of engine power.
Symptoms
Symptoms of a P1B21 Mastretta Mxt 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.
- 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.
- An air leak forward of the DPF will change the sensor readings resulting in the code
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Common Misdiagnoses
- Vehicle Speed Output Circuit Problem
- Cruise Control Servo Indicates Low Problem
- A/C System High Pressure High Temperature Problem
- PCM Stack Overrun Problem
- Transmission Control Module Reprogrammable Memory Problem
Repair Processes :
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.
Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.
Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.
Process Tips
Diagnostic trouble code P1B21 Mastretta Mxt 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 P1B21 Mastretta Mxt.
Fortunately, P1B21 Mastretta Mxt is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
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