P040E
EGR Temperature Sensor A Circuit Intermittent/Erratic
EGR temperature sensor A signal jumps or drops out intermittently. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
EGR temperature sensor A signal jumps or drops out intermittently. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
Common causes
- high
Intermittent connector
One of the most commonly reported causes for this code — check this first.
Typical part cost: $40-440
- low
Connector with intermittent contact under vibration
Less common, but worth ruling out after the more likely causes.
Typical part cost: $40-440
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P040E.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P040E.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P040E.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does P040E mean?
P040E means "EGR Temperature Sensor A Circuit Intermittent/Erratic". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P040E?
intermittent connector; connector with intermittent contact under vibration; harness routed against vibrating component — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full P040E diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.