P041A
EGR Temperature Sensor B Circuit
Emissions / EGR
Generic OBD-II
Medium
What it means
P041A means the ECM detected a fault in the circuit of the second EGR temperature sensor. This sensor helps confirm exhaust gas is flowing through the EGR system. A circuit problem — usually a failed sensor, damaged wiring, or a bad connector — sets the code but generally causes no obvious driveability issue.
Medium
Can I keep driving? Safe to drive. This is an emissions-monitoring fault with usually no noticeable driveability issue, but it can fail an emissions test.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable change in how the vehicle drives
- May fail an emissions/readiness test
- Occasional pinging under load if EGR flow is affected
Common causes
Most likely first
- Faulty EGR temperature sensor BLikely
- Open or shorted wiring in the sensor circuitCommon
- Loose or corroded connectorCommon
- Carbon or soot fouling the sensor tipLess often
- EGR passage restriction the sensor is correctly reportingLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note the temperature the sensor is reporting.
- Inspect the sensor connector and wiring for opens, shorts, or corrosion.
- Remove the sensor and check the tip for heavy carbon buildup; clean or replace.
- Inspect the EGR valve and passages for clogging if EGR flow seems affected.
- Replace the EGR temperature sensor B if faulty. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P041A?+
Yes. It seldom affects driveability, but it's an emissions fault, so repair it before an emissions test and to keep the EGR system monitored correctly.
Can I just clear P041A?+
It returns while the circuit fault remains. Repair the sensor or wiring first, then clear and re-test.
Related codes
Often seen with P041A
Read & clear P041A yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX