C1059 Engine Trouble Code
What is C1059?
C1059 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: | C1059 |
C1059 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
C1059 Code Structure
Understanding what each digit means in the C1059 chassis trouble code:
| C | 1 | 0 | 5 | 9 |
|---|---|---|---|---|
| Chassis Code | Fuel And Air Metering | Ambient Air Temperature Sensor Circuit Low | Cylinder 1 Injector Circuit Low | Reverse Input Circuit |
How to Fix C1059
Diagnostic Steps:
Regarding C1059, 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:
Disconnected, dirty, or fouled spark plugs commonly prevent proper engine operation. Replace spark plugs every season or 25 hours. Verify proper spark plug gap. If plugs are good, check ignition components: spark plug wires, coils, and ignition module.
Technical Notes:
Parts or components should not be replaced based solely on C1059 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
C1059 Description
C1059 engine trouble code is related to Reverse Input Circuit.
Main Cause
The primary reason for C1059 OBD-II Engine Trouble Code is: Ambient Air Temperature Sensor Circuit Low.