U017A Mercedes-Benz 240 Diagnostic Trouble Code

U017A Mercedes-Benz 240 code definition:
U017A is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code for Mercedes-Benz 240.

U017A Mercedes-Benz 240 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. Any code that causes the vehicle's engine to die while running should be fixed as soon as possible, as it can be dangerous for both the vehicle and the passengers of the vehicle.

Symptoms

Symptoms of a U017A Mercedes-Benz 240 diagnostic trouble code may include:
  • Vacuum leak on the engine
  • Reduction in engine performance, especially at low RPM levels
  • Engine surge
  • If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Place of U017A in engine

Possible Causes :

  • Fuel with a large percentage of sulfur will clog the DPF quickly
  • The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
  • Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Common Misdiagnoses

  1. Exhaust Gas Recirculation System Valve 1 Problem
  2. BBV Sensor Circuit Low Voltage Problem
  3. Transmission Engaged At High Throttle Angle Problem
  4. Cruise Inhibit Control Circuit Problem
  5. TFP Valve Position Switch-Drive Without Drive Ratio 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. 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.

Process Tips

Diagnostic trouble code U017A Mercedes-Benz 240 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 U017A Mercedes-Benz 240.

Fortunately, U017A Mercedes-Benz 240 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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