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.
Exhaust Gas RECIRCULATION: Description
All diesel models are equipped with exhaust gas recirculation (EGR). The system reduces oxides of nitrogen (NOx) by allowing a small quantity of exhaust gas to enter the intake manifold. This lowers combustion chamber temperatures and reduces NOx formation.
The 5-cylinder system consists of an EGR valve, thermal vacuum valve, switch-over valves, vacuum control valve, several orifices and connecting hoses.
The 4-cylinder system consists of a control unit, electric switch-over valve, throttle valve housing, corrugated tube to return gases, several orifices and a TDC transmitter.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.