B0490 Engine Trouble Code
What is B0490?
B0490 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 Body (B) Trouble Code |
| System: | Body |
| Code: | B0490 |
B0490 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
B0490 Code Structure
Understanding what each digit means in the B0490 body trouble code:
| B | 0 | 4 | 9 | 0 |
|---|---|---|---|---|
| Body Code | Intake Valve Control Solenoid Circuit Low | O2 Sensor Heater Circuit Malfunction | Crankshaft Position Sensor A Circuit Malfunction | Shift Solenoid E Performance or Stuck Off |
How to Fix B0490
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:
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 B0490, verify VCT solenoid operation. Look for stuck or sticking valves caused by contamination. Consult vehicle-specific repair manual for proper component testing procedures.
B0490 Description
B0490 engine trouble code is related to Shift Solenoid E Performance or Stuck Off.
Main Cause
The primary reason for B0490 OBD-II Engine Trouble Code is: O2 Sensor Heater Circuit Malfunction.