MOT Emissions Fail – diagnostic and Engine Carbon Clean – Saab 93 1.9 TDi (2009 – 128,628 miles)

⚠️ MOT Fail on emissions?

🚗 Here we have a Saab 93 1.9 TDi (2009 – 128,628 miles) booked in for diagnostics and Engine Carbon Clean after failing on emissions. The garage plugged in and found no codes present so they recommended us to the owner to see if we could help.

🔎 Initial inspection of the engine bay found no injector leaks or any evidence of any intake leaks, although there was a significant amount of bass note to the engine.

💻 Initial diagnostics found no engine codes present, but some codes present for other parts of the vehicle such as parking sensors, etc.

📊 Live data showed initial coolant temperature sat at 82°C and the inside fans had been left off as we had instructed prior to the booking – with the fans back on inside the temperature plummeted within a minute to 72°C – running way too cold and with normal driving (heater on and cold air coming in on the radiator then this will be running cold when driven). All other live data looked OK, although DPF data suggested a lot of soot present given the recent regeneration so either that aborted due to temperature or the engine running cold and filling up the DPF rapidly.

🌡️ This vehicle needs a new thermostat and cold running vehicles will suffer with much higher emissions and drastically reduced fuel economy.

👨‍🔧 On with the clean and with the bonnet lowered, fans off we managed to maintain enough temperature to get it through the clean and much quieter, smooth and responsive again by the end.

MOT Emissions Fail - diagnostic and Engine Carbon Clean - Saab 93 1.9 TDi (2009 - 128,628 miles)
MOT Emissions Fail - diagnostic and Engine Carbon Clean - Saab 93 1.9 TDi (2009 - 128,628 miles)
MOT Emissions Fail - diagnostic and Engine Carbon Clean - Saab 93 1.9 TDi (2009 - 128,628 miles)

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