U2021 Mitsubishi CZ Diagnostic Trouble Code

U2021 Mitsubishi CZ code definition:
U2021 is a kind of OBD-II Diagnostic U-Network Diagnostic Trouble Code for Mitsubishi CZ.

U2021 Mitsubishi CZ is triggered when the bank 1 camshaft position sensor doesn't match the signal from the crankshaft position sensor. 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 U2021 Mitsubishi CZ diagnostic trouble code may include:
  • Fuel pressure too high
  • Diminished fuel efficiency
  • Rich or lean exhaust
  • Lack of power
Place of U2021 in engine

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
  • Faulty IMRC actuator relay (if equipped)

Common Misdiagnoses

  1. TP Sensor Learn Not Complete Problem
  2. Low Coolant Circuit Problem
  3. Cruise Control System - Vehicle Accel Too High Problem
  4. TFP Valve Position Switch-Drive Without Drive Ratio Problem
  5. 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. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code U2021 Mitsubishi CZ 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 U2021 Mitsubishi CZ.

Fortunately, U2021 Mitsubishi CZ is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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