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EGR Fault Codes Explained: P0401, P0402, P0403 and P0404 on Modern Diesels

EGR fault code diagnostics on a modern diesel engine using an OBD scan tool

EGR Fault Codes Explained: P0401, P0402, P0403 and P0404 on Modern Diesels Four codes, two completely different problems. P0401 and P0402 are about how much exhaust gas is actually moving. P0403 and P0404 are about wiring and position feedback. Read them in the wrong order and you end up buying a valve you never needed. […]

EGR Blanking Plate vs EGR Delete Remap: What Actually Works on a Diesel

EGR blanking plate diagnosis on a diesel engine bay with a scan tool connected

EGR Blanking Plate vs EGR Delete Remap: What Actually Works on a Diesel One is a £6 piece of stainless steel. The other is a change to the software that decides how your engine breathes. They get talked about as if they are the same job — and that misunderstanding is why so many drivers […]

What Is EGR Valve? Is It Failing? What Is The Solution?

Carbon-coated diesel EGR valve on a garage workbench, showing key information regarding EGR build-up

If your car’s been running rough, using more fuel than usual, or flashing warning lights – the EGR valve might be to blame.This small part has a big impact on your engine’s health and emissions.Let’s walk through what it is, why it fails, and how to fix it – fast. What Is EGR Valve? The […]

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