B1407 Engine Trouble Code
What is B1407?
When B1407 code appears, first check your gas cap. Pull over safely, ensure it is tight, and inspect for cracks. A loose or damaged gas cap affects fuel-system pressure and emissions. A replacement cap costs about $3–$10. This simple fix can resolve the code and improve fuel economy.
Code Information
| Code Type: | OBD-II Body (B) Trouble Code |
| System: | Body |
| Code: | B1407 |
B1407 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
B1407 Code Structure
Understanding what each digit means in the B1407 body trouble code:
| B | 1 | 4 | 0 | 7 |
|---|---|---|---|---|
| Body Code | Fuel And Air Metering | O2 Sensor Heater Circuit Malfunction | Cold Start Injector 1 Malfunction | Shift/Timing Solenoid Malfunction |
How to Fix B1407
Diagnostic Steps:
Oxygen sensors measure exhaust gas oxygen content to optimise air-fuel ratio. This optimisation improves fuel economy and reduces emissions. Sensors degrade over time and require periodic replacement.
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 B1407 DTC. Consult your vehicle service manual for proper diagnostic procedures, possible causes, and required testing before replacement.
B1407 Description
B1407 engine trouble code is related to Shift/Timing Solenoid Malfunction.
Main Cause
The primary reason for B1407 OBD-II Engine Trouble Code is: O2 Sensor Heater Circuit Malfunction.