Your Passat B8 diesel losing power under load and blowing black smoke? Likely EGR or DPF clogging. Here’s what to check and whether you can keep driving safely.
Common Causes of Power Loss and Black Smoke
When your Volkswagen Passat B8 diesel engine feels sluggish under load and emits black smoke, it's a classic sign of incomplete combustion. The two usual suspects are a clogged EGR valve (exhaust gas recirculation) or a blocked DPF (diesel particulate filter). A stuck EGR restricts airflow and recirculates too much exhaust, while a clogged DPF creates excessive backpressure. Both cause the engine to struggle, especially when accelerating.
