U0312 Mercedes Glc Diagnostic Trouble Code
U0312 Mercedes Glc code definition:
U0312 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code for Mercedes Glc.
U0312 Mercedes Glc 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. This is because the barometric pressure sensor is part of the MAF sensor. Sometimes, the MAF's sensing wire can accumulate and get covered with dirt, dust and/or oil residue, which can also lead to the error code.
Symptoms
Symptoms of a U0312 Mercedes Glc 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
- Rich or lean exhaust
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Possible Causes :
- The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
- Fuel with a large percentage of sulfur will clog the DPF quickly
- Defective ECU strategies or components will prevent proper regeneration
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Common Misdiagnoses
- TP Sensor Learn Not Complete Problem
- Low Coolant Circuit Problem
- Cruise Control System - Vehicle Accel Too High Problem
- TFP Valve Position Switch-Drive Without Drive Ratio Problem
- Problem
Repair Processes :
Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.
You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.
Process Tips
Diagnostic trouble code U0312 Mercedes Glc 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 U0312 Mercedes Glc.
Fortunately, U0312 Mercedes Glc is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
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