C1889 Diagnostic Trouble Code

C1889 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 C1889 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

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. 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. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code C1889 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 C1889.

Fortunately, C1889 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1889 Trouble Code For Specific Cars

C1889 Oldsmobile Alero Cylinder 6 Injector Circuit Low
C1889 Lancia D50 Speed Wheel Sensor LR Circuit Open
C1889 Land Rover Velar Synchronization Fault
C1889 Gmc Terracross Park Brake Switch # 2 Released Circuit Failure
C1889 Mercedes E 400 Acceleration Position Sensor Conflict
C1889 Plymouth Prowler Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
C1889 Dodge Ram 1500 Ignition Run/Acc Circuit Short To Ground