C3033 Diagnostic Trouble Code

C3033 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C3033 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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 C3033 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 C3033.

Fortunately, C3033 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3033 Trouble Code For Specific Cars

C3033 Mercedes S 560 Air Assisted Injector Control Range/Performance
C3033 Toyota Avensis O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
C3033 Volkswagen Caravelle Reverse Inhibit Control Circuit Malfunction
C3033 Morgan Plus Brake Fluid Level Sensor Input Short Circuit To Battery
C3033 Warwick Buick SCP (J1850) Invalid or Missing Data for Memory Storage
C3033 Toyota Fortuner Oil Change Lamp Circuit Short To Battery
C3033 Daewoo Evanda Fuel Volume Regulator Control Circuit/Open