Diagnostic Consultation and Engine Carbon Clean on a VW Scirocco 2.0 TDI (2009 – 101,690 miles)

⚠️ Like to look after your vehicle? Get it checked over and cleaned up with our Which? Trusted Traders approved service.

🚗 Here we have a VW Scirocco 2.0 TDI (2009 – 101,690 miles) booked in for diagnostics and Engine Carbon Clean as a preventative measure. The owner wanted to look after the vehicle given it was doing a short commute to work.

🔎 Initial inspection found little of note in the engine bay apart from the usual bass note from the buildup present. Thankfully no engine mount wobble on this one.

💻 Initial diagnostic code check looked pretty clear apart from an intermittent code for P159D Oil Level Thermal Sensor Implausible Signal – we recommended this to be changed asap.

📊 Live data looked pretty good across the board with all EGR, DPF and injector data looking fine, but the temperature was a slight concern. Hottest we could get this to was 88°C and with fans on dropped rapidly to 78°C. Given the short journeys then a thermostat may be required to ensure regeneration continues successfully.

👨‍🔧 On with the clean and the engine soon smoothed out and quietened down and by the end was quiet, smooth and responsive again.

Diagnostic Consultation and Engine Carbon Clean on a VW Scirocco 2.0 TDI (2009 - 101,690 miles)
Diagnostic Consultation and Engine Carbon Clean on a VW Scirocco 2.0 TDI (2009 - 101,690 miles)
With codes cleared this one kept popping back on within minutes
Diagnostic Consultation and Engine Carbon Clean on a VW Scirocco 2.0 TDI (2009 - 101,690 miles)
With bonnet down and cabin fans on we managed to finally get this to 88°C
Diagnostic Consultation and Engine Carbon Clean on a VW Scirocco 2.0 TDI (2009 - 101,690 miles)
With the fans turned on it rapidly dropped to 78°C
Diagnostic Consultation and Engine Carbon Clean on a VW Scirocco 2.0 TDI (2009 - 101,690 miles)
All exhaust gas temperature sensors working fine, DPF backpressure and soot content low and 267 miles since the last regeneration.
Diagnostic Consultation and Engine Carbon Clean on a VW Scirocco 2.0 TDI (2009 - 101,690 miles)
EGR flow was good and injectors were all within tolerances
Diagnostic Consultation and Engine Carbon Clean on a VW Scirocco 2.0 TDI (2009 - 101,690 miles)
Bonnet down to keep it warm

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