Carbon is not your friend when it comes to engine performance and emission controls. Follow this Real Fix to see how the diagnostic codes on this Volkswagen Golf diesel were diagnosed and confirmed the faulty device.
Vehicle
2010 Volkswagen Golf 1.6 Diesel
Title
7563, P0407, P046C, Replaced Exhaust Gas Recirculation Valve
Complaint
The customer states the check engine light is on.
Cause
Connected a scan tool and found codes: 7563 – Exhaust Gas Recirculation Sensor A Circuit Range /
Performance; P0407 – Exhaust Gas Recirculation Sensor “B” Circuit Low and P046C – Exhaust Gas
Recirculation Sensor “A” Circuit Range/Performance. Used the scan tool to repeatedly command
the exhaust gas recirculation valve open and closed, monitored the valve position parameters on
the scan tool, and found the valve actual position parameter never matched the valve desired
position parameter. Disconnected the exhaust gas recirculation valve connector, visually
inspected the connector and terminals, and found no obvious signs of damage. With the key on,
engine off, used a multi-meter to check for the presence of voltage and ground at the exhaust gas
recirculation valve, and found both were present. Used the multi-meter to measure the resistance
of the exhaust gas recirculation valve, and found the measured resistance was within
specifications. Removed the exhaust gas recirculation valve, performed a visual inspection of the
exhaust gas recirculation valve and found it was clogged with carbon. The results of these tests
verified the exhaust gas recirculation valve was faulty.
Correction
Replaced the exhaust gas recirculation valve, cleared codes, performed a road test and verified
the vehicle operated properly.
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