P0406 Infiniti Code - Exhaust Gas Recirculation Temperature Sensor Circuit High Input
Quick Answer
The P0406 Infiniti code indicates a problem with the Exhaust Gas Recirculation (EGR) Temperature Sensor Circuit, specifically detecting a high input signal. Common causes include Faulty EGR temperature sensor, Wiring issues in the sensor circuit, EGR valve stuck open. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0406 Infiniti indicates Exhaust Gas Recirculation Temperature Sensor Circuit High Input.
- Common causes
- Common causes include Faulty EGR temperature sensor, Wiring issues in the sensor circuit, EGR valve stuck open.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
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Code P0406 Infiniti Description
The P0406 Infiniti code indicates a problem with the Exhaust Gas Recirculation (EGR) Temperature Sensor Circuit, specifically detecting a high input signal. The EGR system plays a crucial role in reducing harmful emissions by recirculating a portion of the exhaust gases back into the engine's intake system. The EGR temperature sensor is responsible for monitoring the temperature of the gases entering the EGR system. When the sensor detects a high input signal, it means that the temperature of the recirculated gases is outside of the normal operating range.
Common Causes of P0406 Infiniti
- Faulty EGR temperature sensor
- Wiring issues in the sensor circuit
- EGR valve stuck open
- Carbon buildup in the EGR system
- Engine coolant temperature sensor malfunction
Symptoms of P0406 Infiniti
- Check Engine light illuminated on the dashboard
- Decreased fuel efficiency
- Rough idling or engine stalling
- Engine knocking or pinging noises
- Increased emissions
How to Fix P0406 Infiniti
- Diagnose the issue using a scan tool to confirm the P0406 code and identify the specific cause.
- Inspect the EGR temperature sensor and its wiring for any damage or corrosion. Replace the sensor if necessary.
- Clean the EGR valve and passages to remove any carbon buildup that may be affecting its operation.
- Test the EGR system to ensure proper function and clear the trouble code from the vehicle's memory.
- If the issue persists, further diagnosis may be required to identify any underlying problems with the EGR system components.
Cost to Fix P0406 Infiniti
The typical repair costs for addressing a P0406 code can vary depending on the specific cause of the issue. In general, replacing the EGR temperature sensor can range from $100 to $300, including parts and labor. However, if additional repairs or replacements are needed for the EGR valve or wiring, the total cost could increase. It's important to consider the specific diagnosis time and labor rates at auto repair shops in your area to get a more accurate estimate for the repair.
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