Signs Your Diesel Needs Attention

Diesels usually warn you first

Most diesel faults develop over time. Watch for:

• Loss of power, especially when loaded or towing
• Black, white or blue smoke from the exhaust
• Hard starting or rough running when cold
• A diesel particulate filter (DPF) warning light
• Fuel use rising with no change in how you drive
• Whistling, whining or oil around the turbo

Why testing comes first

Different faults can cause the same symptom. A loss of power might be a blocked filter, a boost leak, an injector problem or a sensor fault. Testing narrows it down so parts are only replaced when they need to be.

Note when the problem happens — cold or hot, loaded or empty, uphill or on the flat. That detail makes diagnosis quicker.