P0198 Volkswagen Microbus Diagnostic Trouble Code
P0198 Volkswagen Microbus code definition:
P0198 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code for Volkswagen Microbus.
P0198 Volkswagen Microbus 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. So if the problem persists despite of your diagnosis, then you should never hesitate to take your vehicle to your dealer or to a qualified mechanic.
Symptoms
Symptoms of a P0198 Volkswagen Microbus diagnostic trouble code may include:
- Possible spark knock (detonation / pre-ignition)
- Poor fuel economy
- 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
- The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
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Possible Causes :
- Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
- Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
- Defective ECU strategies or components will prevent proper regeneration
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Common Misdiagnoses
- Crankshaft Position Sensor Circuit Performance Problem
- TP Sensor Learn Not Complete Problem
- Low Coolant Circuit Problem
- Cruise Control System - Vehicle Accel Too High Problem
- Kick-Down Switch Failed Short Problem
Repair Processes :
Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.
Look at the plug wires to make sure they are not burnt or laying on the exhaust.
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 P0198 Volkswagen Microbus 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 P0198 Volkswagen Microbus.
Fortunately, P0198 Volkswagen Microbus is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
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