P1402 – Mazda DTC

Mazda DTC P1402 – EGR Valve Position Sensor Circuit

DTC P1402 meaning on Mazda

1. DTC P1402 indicates a fault in the EGR (Exhaust Gas Recirculation) Valve Position Sensor Circuit on Mazda vehicles.

Mazda DTC P1402 symptoms

• Check Engine Light (MIL) illuminated on the dashboard.
• Decreased engine performance.
• Possible rough idling or stalling.

Mazda DTC P1402 causes

• Malfunctioning EGR Valve Position Sensor.
• Wiring issues in the EGR Valve Position Sensor circuit.
• Corrosion or poor connections in the sensor circuit.

Mazda DTC P1402 seriousness

1. While the vehicle may still be operable with this fault, it can lead to decreased fuel efficiency and increased emissions.

How to diagnose DTC P1402 on Mazda

1. Use an OBD-II scanner to retrieve the specific fault code (DTC P1402).
2. Inspect the EGR Valve Position Sensor and its wiring for any visible damage or corrosion.
3. Test the sensor’s resistance and voltage output to determine if it is functioning correctly.

How to fix DTC P1402 on Mazda

1. Replace the EGR Valve Position Sensor if it is found to be faulty.
2. Repair any damaged wiring or connections in the sensor circuit.
3. Clear the DTC P1402 code from the vehicle’s ECU after completing repairs.

How to erase DTC P1402 on Mazda

1. Use an OBD-II scanner to clear the DTC P1402 code from the vehicle’s ECU.
2. Ensure that the underlying issue causing the fault code has been resolved before clearing the code.

Recommended tools for Mazda diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.