EGR Position Sensor
EGR position sensor is out of normal range.
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What it means (plain English)
The EGR (Exhaust Gas Recirculation) position sensor tells your engine's computer how much exhaust is being recirculated back into the engine to reduce emissions. If the signal from this sensor is too high or too low, the computer thinks something's wrong and throws a warning.
What the computer is actually seeing
The engine control unit (ECU) compares the actual position of the EGR valve to the expected position, based on engine load and RPM. A difference too great results in the SPN 1120 fault code.
What a healthy reading looks like
The EGR position sensor should output a voltage between 0.5V (fully closed) to 4.5V (fully open) depending on the EGR flow demand; typically around 2.5V at idle.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect EGR sensor wiring and connectors for damage or corrosion. Fix as needed. Decision point: If wiring is good, move to step 2. If damaged, repair or replace as needed.
- 22. Measure the EGR position sensor output voltage with a multimeter. Expect 0.5V to 4.5V. Decision point: If within range, move to step 3. If out of range, sensor may be faulty; replace.
- 33. Check EGR valve operation. If the valve is stuck, clean or replace it. Decision point: If the valve operates normally, move to step 4. If it’s stuck, that’s your issue; replace it.
- 44. If all components are okay, check the engine control unit (ECU) for DTCs. Look for software updates or faults. Decision point: If no other codes present, further diagnostics on the ECU might be needed.
Common causes
- Faulty EGR position sensor
- Wiring issue or damaged connector
- EGR valve stuck open or closed
- ECU software issue
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
Yes, but performance may be affected and emissions levels may increase.
Will this code come back after clearing it?
It might, especially if the underlying issue isn't fixed.
Why does this code sometimes appear with other codes?
It's common for fuel system and EGR codes to trigger together due to related components failing.
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