Fault code P0475 – a step-by-step guide to diagnosing and fixing it

Error code P0475 is displayed and the check engine light is on - what does this mean?

DTC P0475 is triggered by the OBD/EOBD system when a problem is detected with the exhaust gas recirculation valve (EGR valve) or its control circuit. This fault code indicates a fault in the exhaust gas recirculation system, which is responsible for reducing nitrogen oxide emissions.

What can cause this error code?

• Defective EGR valve (exhaust gas recirculation valve)
• Blocked EGR channels due to soot deposits
• Damaged vacuum hose system
• Defective EGR position sensor
• Corroded or loose plug connections
• Defective engine control unit (ECU)
• Blocked EGR cooler
• Faulty wiring in the EGR circuit

What symptoms occur in parallel with fault code P0475?

• Engine performance: Noticeable reduction in performance and uneven engine running
• Starting behavior: Difficulty starting the engine cold
• Exhaust emissions: Increased pollutant emissions and black smoke
• Fuel consumption: Significantly increased consumption
• Engine noise: Knocking or unusual engine noises
• Idling problems: Unsteady or fluctuating idling

How can I fix the problem with error code P0475?

• Repairing trouble code P0475 requires a systematic approach to identifying and eliminating the cause.
• Remove the EGR valve, clean it thoroughly or replace it completely if irreparably damaged
• Remove soot deposits and coking from the EGR ducts and lines using a special cleaner
• Check vacuum hoses for cracks and leaks and replace defective hoses
• Test the EGR position sensor and replace with a new component if defective
• Check all electrical connections and plugs for corrosion and clean or replace them
• Read out engine control unit with diagnostic device and carry out software update if necessary
• Check EGR cooler for blockages and clean or replace if necessary