C1663 Engine Trouble Code
What is C1663?
C1663 code can indicate a faulty oxygen sensor, which may eventually damage the catalytic converter (repair cost: $2,000–$2,200). Professional diagnosis costs around $200–$210. Oxygen sensors are often straightforward to replace — check your owner's manual for location and instructions. This issue should be addressed promptly to prevent further damage.
Code Information
| Code Type: | OBD-II Chassis (C) Trouble Code |
| System: | Chassis |
| Code: | C1663 |
C1663 Symptoms
Check Engine Light
Illuminated dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration
Starting Problems
Difficulty starting the engine
C1663 Code Structure
Understanding what each digit means in the C1663 chassis trouble code:
| C | 1 | 6 | 6 | 3 |
|---|---|---|---|---|
| Chassis Code | Fuel And Air Metering | Fuel Temperature Sensor B Circuit Range/Performance | Cylinder 4 Contribution/Balance Fault | Exhaust Gas Recirculation Sensor B Circuit High |
How to Fix C1663
Diagnostic Steps:
Regarding C1663, carefully inspect the wire harness near the intake manifold bracket, best accessed from below near the oil filter. Look for chafing, pinching, or damaged insulation.
Repair Solution:
A/C pressure sensor monitors refrigerant pressure changes. DTC sets when pressure change falls outside calibration. Verify A/C system function, refrigerant charge, and electrical connections.
Technical Notes:
For C1663, verify VCT solenoid operation. Look for stuck or sticking valves caused by contamination. Consult vehicle-specific repair manual for proper component testing procedures.
C1663 Description
C1663 engine trouble code is related to Exhaust Gas Recirculation Sensor B Circuit High.
Main Cause
The primary reason for C1663 OBD-II Engine Trouble Code is: Fuel Temperature Sensor B Circuit Range/Performance.