Honda Accord (2009 – 101,336 miles) with DPF issues from running cold – due to an old thermostat

🛻 Honda Accord (2009 – 101,336 miles) with DPF issues from running cold – due to an old thermostat 🌡️

This one had been to the dealers a number of times for DPF Cleans, but the underlying issue had never been identified and the owner blamed for doing short journeys even though doing 60 miles a day.

❗ DPF Cleans are unnecessary and NOT recommended unless you have a blocked DPF.

Most of the DPF light related bookings we attend are usually down to issues with regeneration, but as long as the issues are correctly identified and resolved before the DPF blocks then the vehicle will start regenerating again – no need to clean it.

The most common issues we see stopping DPF regeneration are…

– Not getting warm enough – short journeys or a lazy sticking thermostat
– Not enough fuel – always try to keep above ¼ tank fuel in a diesel vehicle with a DPF.
– Glow plugs – BMWs of a certain vintage will flat out refuse to regenerate, other makes and models may still regenerate, but poorly.
– Differential pressure sensor failing or failed
– Exhaust Gas Temperature sensors failing or failed
– Other engine codes the manufacturer deemed important enough to stop regeneration due to safety.

Unfortunately with this one the backpressure and soot levels on the DPF were beyond the point of regeneration and a DPF Clean was needed.

❗The culprit for this one was the thermostat not allowing the vehicle to get above 71°C.

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