P0171 Fuel Trim System Lean – Thermostat stuck shut – Vauxhall Zafira 1.6 (2008 – 124,352 miles)

❗ Live Data Diagnostics is essential to understand what's happening with a vehicle.

Vauxhall Zafira 1.6 petrol (2008 – 124,352 miles) owned since before Christmas.

Reason for booking in…
‘Engine Light coming on for running lean codes'

Initial inspection found no obvious issues in the engine bay apart from it being well up to temperature.

Initial code read found…
P0171-52 Fuel Trim System Lean

We dived straight into the live data and sure enough the vehicle was running very hot at 112°C and had to pop the bonnet and pop the heating on full to bring the temperatures down to 98°C.

‍On with the clean and we kept the bonnet up and heating on full hot to vent the temperature (it still ran at 100°C under these conditions) and crept it through the clean. By the end it was quiet, smooth and responsive again and the owner can now sort out a new thermostat ASAP.

☑️ Full Diagnostics
☑️ Engine Carbon Clean
☑️ Safety first, fully insured, IMI Certified and Which? Trusted Traders approved.

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