The summaries for each exhaust smoke type are directly below but you can scroll down the page for a full explanation… We’ve also indicated whether the problem will need to be fixed and whether it's a costly repair. We've separated the different kinds of smoke you'll come across to help you quickly identify what problem causes which smoke. If you drive a hybrid, you too could see your exhaust putting out something that you might not be prepared for. The smoke you see can be caused by different things, depending on whether your car has a petrol or diesel engine. This can be a useful clue when buying a used car, because if the service history is incomplete, a smoking exhaust can be a tell-tale sign of underlying problems. The real issue is with cars that have been poorly maintained, as smoke from the exhaust could be a clear sign of neglect. If your car is well maintained and serviced regularly, then any visible emissions from your exhaust are unlikely to be anything of concern, but it is well worth checking anyway. The main causes of smoke from an exhaust can vary depending on your car and its condition. Is it white, grey, or with a hint of a blue tinge to it? Or is it thick and black? Does it evaporate as soon as it's in the air? Or does the smoke linger and come with an acrid smell? If it's black smoke, then does it leave soot on the road under the exhaust tip when the car is stationary? Once you've worked out when the smoke occurs, next you need to try and determine what kind of smoke it is. If it only appears when you are accelerating, that might indicate a different problem than if it only appears when stationary, or is a constant when the engine is running. The first step is to identify exactly when the smoke is coming out of your car’s exhaust. Diagnosing a smokey exhaust: what to look for So what exactly does a smoking exhaust mean? There are a number of potential causes of pollutants coming from your car's rear end, and our handy guide is here to help you figure out what's going on with your car. Catalytic converters explained: how they work and theft prevention
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