B1439 Engine Trouble Code
What is B1439?
B1439 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: | B1439 |
B1439 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
B1439 Code Structure
Understanding what each digit means in the B1439 body trouble code:
| B | 1 | 4 | 3 | 9 |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering | O2 Sensor Heater Circuit Malfunction | Injection Pump Fuel Metering Control 'A' High | Reverse Input Circuit |
How to Fix B1439
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:
Power steering pressure switch monitors system operation. If pressure changes are not detected after calibrated speed transitions, this DTC sets. Verify PSP switch operation and check for circuit opens or shorts.
Technical Notes:
B1439 DTCs can be triggered by upstream issues. For example, a dirty MAF sensor may cause incorrect fuel-trim adjustments, leading oxygen sensors to report mixture problems. Address root causes first.
B1439 Description
B1439 engine trouble code is related to Reverse Input Circuit.
Main Cause
The primary reason for B1439 OBD-II Engine Trouble Code is: O2 Sensor Heater Circuit Malfunction.