P0120 Renault Megane 2 Diagnostic Trouble Code
P0120 Renault Megane 2 code definition:
P0120 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code for Renault Megane 2.
P0120 Renault Megane 2 is defined as Cylinder 3 Injector Circuit Malfunction. This code means the PCM (powertrain control module, also known as ECM or engine control) has detected a problem in the injector or its wiring, or in injector circuit for cylinder 3. The spark should have a light tan color. If the sensor probe comes with white and chalky parts, this means it has been lagging between switching phases, and should be replaced.
Symptoms
Symptoms of a P0120 Renault Megane 2 diagnostic trouble code may include:
- 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
- Faulty or damaged wiring
- Hesitation upon acceleration
- Rich or lean exhaust
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Possible Causes :
- Faulty IMRC actuator relay (if equipped)
- A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
- Defective ECU strategies or components will prevent proper regeneration
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Common Misdiagnoses
- Control Module Throttle Actuator Position Performance Problem
- Air Conditioning (A/C) Clutch Feedback Circuit High Voltage Problem
- Cruise Vehicle Speed/Set Speed Difference Too High Problem
- Kick-Down Switch Failed Short Problem
- Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit Problem
Repair Processes :
Now, clear the codes and test-drive the vehicle to see if the code is reset.
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.
Process Tips
Diagnostic trouble code P0120 Renault Megane 2 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 P0120 Renault Megane 2.
Fortunately, P0120 Renault Megane 2 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
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