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What Are Common BMW N20 Engine Problems?

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  Photo by Sevak Khachatoorian on Unsplash The BMW N20 engine has a complicated legacy. Introduced in 2011 as a replacement for the naturally aspirated N52 six-cylinder, the N20 was BMW's first turbocharged four-cylinder in the modern era — a 2.0-litre unit designed to deliver six-cylinder performance with four-cylinder economy. In terms of outright capability, it largely delivered on that promise. In terms of long-term reliability, it developed a reputation that is difficult to ignore. If you own an N20-powered BMW or are considering buying one, this guide covers everything you need to know: what goes wrong, when it goes wrong, how serious each fault is, and what the repair costs look like in the UK. What Is the BMW N20 Engine? The N20 is a 2.0-litre turbocharged inline-four petrol engine fitted across a wide range of BMW models from 2011 to approximately 2017, when it was progressively replaced by the B48. The N20B20A is the primary variant — the code you'll see in parts cata...

What Are Common BMW N54 Engine Problems? (And How to Fix Them)

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  Photo by Christian Wiediger on Unsplash Nobody buys a BMW 335i, 135i or 535i expecting a quiet life. You buy one because it's properly quick, sounds fantastic, and, if you ever get curious about what lurks beneath that bonnet, turns out to be one of the most tuneable engines BMW has ever produced. Three hundred horsepower from the factory, and with a modest tune, you're looking at four hundred without breaking a sweat. The N54 also leaks oil like a sieve, eats fuel pumps for breakfast, and will rattle at you from the turbos until you either fix it or learn to live with the noise. It shipped with fuel injectors, which BMW quietly revised multiple times because the originals weren't up to scratch. The BMW water pump is electric, which sounds clever until it produces problems. That's the deal with the N54. You know this going in, or you find out the hard way. Either way, this guide tells you what to watch for, what it means when something goes wrong, and what to do abou...