P1403 Engine Trouble Code
What is P1403?
The P1403 check-engine light can indicate issues ranging from minor (loose gas cap) to serious (catalytic converter failure). Professional diagnostic scanning at a dealer or shop will identify the exact cause and required repairs.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Code: | P1403 |
P1403 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
P1403 Code Structure
Understanding what each digit means in the P1403 powertrain trouble code:
| P | 1 | 4 | 0 | 3 |
|---|---|---|---|---|
| Powertrain Code | Fuel And Air Metering | O2 Sensor Heater Circuit Malfunction | Cold Start Injector 1 Malfunction | Exhaust Gas Recirculation Sensor B Circuit High |
How to Fix P1403
Diagnostic Steps:
Check if fuel pump primes when key is turned to ON. Measure fuel pressure and verify bright white-blue spark at all plugs. Also verify mechanical timing alignment.
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:
P1403 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.
P1403 Description
P1403 OBD-II Trouble Code: DPFE Sensor Hoses Reversed is one of the definitions for the P1403; however your vehicles manufacturer may have a different definition for the P1403 code. Please check below for your specific make.
Main Cause
The primary reason for P1403 OBD-II Engine Trouble Code is: O2 Sensor Heater Circuit Malfunction.