2012 Mercedes-Benz P0302: What It Means & Is It Safe to Drive?
P0302 on the 2012 Mercedes-Benz: Cylinder 2 Misfire Detected. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
The PCM has detected a misfire on cylinder 2. Same logic as P0301, but for a different cylinder.
Common causes on the 2012 Mercedes-Benz
- Worn or fouled spark plug on cylinder 2
- Failing ignition coil
- Leaking or clogged fuel injector
- Low compression on cylinder 2
Symptoms
- Check Engine Light
- Noticeable shaking, especially at idle
- Loss of power or hesitation
Typical fixes
- Replace spark plug/coil on cylinder 2
- Clean or replace injector
- Address internal engine problems if compression is low
Repair cost range
For a 2012 Mercedes-Benz, repairs for P0302 typically fall between $150 and $900, depending on the root cause and labor rates in your area.
Known issues on Mercedes-Benz
Mercedes M272 P0302 on cylinder 2 follows the same balance shaft gear diagnosis as P0301. On M272 engines with confirmed good balance shaft timing, a failed ignition coil or spark plug is the next suspect. Mercedes uses a cassette-style ignition coil—replace as a set if one fails.
Most commonly affected models
C300 M272 2007–2012GLK350 M272 2010–2015E350 M272 2006–2012