Q:

How do you change a diesel particulate filter?

A:

Quick Answer

To change a diesel particulate filter, begin by raising and supporting the vehicle, and then locate the diesel particulate filter, and remove any sensor connections. Remove the fasteners securing the diesel particulate filter to the exhaust system, and remove the filter. Install the new filter, and replace all fasteners and sensor connections. Finally, test the system for exhaust leaks.

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Full Answer

The diesel particulate filter removes sooty particulates from a diesel engine's exhaust, reducing the pollution emitted by the vehicle. As soot collects in the diesel particulate filter, the filter becomes more and more restricted. The vehicle's computer control system burns off the accumulated soot in the diesel particulate filter with a regeneration cycle. However, the diesel particulate often fails to regenerate properly, resulting in a clogged filter and reduced engine power.

When replacing the diesel particulate filter, ensure cooling of the exhaust system and always use jack stands to support the vehicle. The most common problem with removing a diesel particulate filter is corroded fasteners; soak the fasteners with penetrating oil before attempting removal. Replacement is a simple matter of removing the fasteners and any sensor connections.

The diesel particulate filter is a fairly new technology, and the regeneration system is computer controlled and requires specialized tools for a proper diagnosis. The filters are expensive, so failing to address the cause of the failure leads to subsequent failures with new filters. Always get a proper diagnosis before replacing a diesel particulate filter.

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