Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Description
The exhaust gas recirculation (EGR) cooler must remain within a specific temperature range to efficiently reduce emissions. Engine coolant flowing through the EGR cooler helps cool the exhaust gases flowing to the EGR valve. The EGR cooler has internal coolant passages and metal fins between the passages to help carry away excessive exhaust gas heat. This diagnostic monitors the temperature of the EGR cooler by monitoring both EGR temperature sensors while the EGR valve is active. If the EGR cooler temperatures exceed a calibrated threshold, this diagnostic will run and fail.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.