Subaru OBD-II 1996 & Newer models DTC P1421 – Exhaust Gas Recirculation Circuit High Input
DTC P1421 meaning on Subaru OBD-II 1996 & Newer models
DTC P1421 indicates a high input in the Exhaust Gas Recirculation (EGR) circuit on Subaru vehicles equipped with OBD-II systems from 1996 onwards.
Subaru OBD-II 1996 & Newer models DTC P1421 symptoms
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine performance
- Potential rough idling or stalling
Subaru OBD-II 1996 & Newer models DTC P1421 causes
- Malfunctioning EGR valve
- Wiring issues in the EGR circuit
- Problems with the EGR position sensor
Subaru OBD-II 1996 & Newer models DTC P1421 seriousness
The seriousness of DTC P1421 lies in its potential to affect engine performance and emissions. Ignoring this code can lead to increased emissions, reduced fuel efficiency, and potential damage to engine components over time.
How to diagnose DTC P1421 on Subaru OBD-II 1996 & Newer models
- Use an OBD-II scanner to retrieve the specific fault code
- Inspect the EGR valve and associated wiring for any visible damage or corrosion
- Test the EGR valve and position sensor for proper functionality
How to fix DTC P1421 on Subaru OBD-II 1996 & Newer models
- Replace the faulty EGR valve if necessary
- Repair any damaged wiring in the EGR circuit
- Calibrate or replace the EGR position sensor as needed
How to erase DTC P1421 on Subaru OBD-II 1996 & Newer models
To clear the DTC P1421 code from the system, you can use an OBD-II scanner to reset the codes. Once the issue has been addressed and fixed, clearing the code will turn off the Check Engine Light.
Recommended tools for Subaru OBD-II 1996 & Newer models diagnostics
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Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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