C3853 Engine Trouble Code
What is C3853?
C3853 indicates potential catalytic converter failure. If completely failed, your vehicle may not run properly and fuel economy will suffer significantly. Average replacement cost is $2,000–$2,140. This repair requires professional service and should not be delayed.
Code Information
| Code Type: | OBD-II Chassis (C) Trouble Code |
| System: | Chassis |
| Code: | C3853 |
C3853 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
C3853 Code Structure
Understanding what each digit means in the C3853 chassis trouble code:
| C | 3 | 8 | 5 | 3 |
|---|---|---|---|---|
| Chassis Code | Ignition System Or Misfire | Engine Oil Temperature Sensor Malfunction | Cylinder 1 Injector Circuit Low | Exhaust Gas Recirculation Sensor B Circuit High |
How to Fix C3853
Diagnostic Steps:
The catalytic converter has oxygen sensors before and after it. When warm and in closed-loop mode, the upstream O2 sensor reading should fluctuate, while downstream should remain steady.
Repair Solution:
Most manufacturers number cylinders sequentially from front to back. Ford V-engines start with cylinder 1 at front left. In V-6 engines, cylinder 4 is front right; in V-8 engines, cylinder 5 occupies that position.
Technical Notes:
For C3853, verify VCT solenoid operation. Look for stuck or sticking valves caused by contamination. Consult vehicle-specific repair manual for proper component testing procedures.
C3853 Description
C3853 engine trouble code is related to Exhaust Gas Recirculation Sensor B Circuit High.
Main Cause
The primary reason for C3853 OBD-II Engine Trouble Code is: Engine Oil Temperature Sensor Malfunction.