C1634 Diagnostic Trouble Code

C1634 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 C1634 diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
Rich or lean exhaust

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
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

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 C1634 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 C1634.

Fortunately, C1634 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1634 Trouble Code For Specific Cars

C1634 Mg Mgc Air Suspension Vent Solenoid Output Circuit Short To Battery
C1634 Csc Mark Iii Fuel Temperature Sensor #1 Circuit Failure
C1634 Volvo S70 SCP (J1850) Invalid or Missing Data for Experimental #2
C1634 Austin 14 Audio Single-Disc CD Player Thermal Shutdown Fault
C1634 Rochet-schneider 12 Hydraulic Pressure Sensor Circuit
C1634 Simca Plein Interior Scanning Sensor Circuit Failure
C1634 Citroen Spacetourer