Vauxhall Insignia DPF Problems

The Vauxhall Insignia, while a popular and efficient car, has been reported to have certain problems associated with its Diesel Particulate Filter (DPF). The DPF is designed to capture and store soot particles produced during the combustion process in diesel engines, preventing them from being released into the atmosphere. However, for the DPF to work efficiently, it needs to undergo a process known as regeneration. This is where the stored soot is burnt off at high temperatures to leave only a small ash residue.

The Problem:

Owners of the Vauxhall Insignia 2.0 CDTi have reported instances where their car frequently enters the ‘limp home mode’. This means the vehicle restricts its performance to prevent damage but can be highly inconvenient. While some advice suggests taking a 60-mile motorway run regularly to allow the DPF to regenerate, this isn’t always practical for everyone, especially those whose commute is short, say about 6 miles.

Underlying Causes:

1. Short Commutes: One of the primary reasons for DPF issues is short commutes. Diesels, in general, need longer runs to get up to the required temperature for the DPF to regenerate. A daily commute of just 12 miles doesn’t give the car enough time to reach optimal temperatures.
2. Wrong Engine Choice: Many believe that if you’re only doing short commutes, opting for a diesel might not be the best choice, both in terms of fuel economy and reliability.
3. Potential Engine Faults: There are suggestions that the problem might not always be with the DPF itself. It could be the engine generating excess soot which the DPF then catches. The EGR valve and the air intake pipework should be checked for faults and leaks.

Possible Solutions:

1. Sell and Switch: One straightforward solution would be to sell the diesel Insignia and opt for a petrol version. Not only would this resolve the DPF issue, but petrol vehicles are also generally cheaper to buy.
2. DPF Removal and Remap: Another solution could be to have the DPF removed and then remap the car. However, there are costs associated with this, and it’s worth noting that removing the DPF may not be legal in all regions due to environmental concerns.
3. Regular Maintenance: Regularly checking the EGR valve and ensuring all pipework is leak-free can be a proactive approach to reduce DPF issues.
4. Replacement: Some suggest that after a certain period (e.g., 5-6 years), the DPF needs to be replaced, especially if filled with incombustible by-products. The cost for this might be in the ballpark of £700.
5. Opt for Brands Known for Fewer DPF Issues: If one is adamant about getting a diesel, then brands like Kia, Hyundai, Honda, and some of Mazda’s newer models are reputed to handle short journeys better without significant DPF problems.

Conclusion:

While the Vauxhall Insignia is a favored choice among many, those who use it primarily for short commutes have faced DPF-related issues. If you’re considering a diesel car, it’s essential to understand the nature of the DPF and how your driving habits might affect its performance. If short journeys are your daily routine, a petrol, hybrid, or electric vehicle might be more suitable.