P2345 — Engine knocking detected on cylinder 10

The engine control unit detected knocking or pinging on cylinder 10, which means that part of the engine is experiencing abnormal combustion. This can happen due to poor fuel quality, incorrect ignition timing, or a problem with the knock sensor or ignition system.

Common causes

The cause is almost always one of a few things. Here they are — P2345 rarely comes from anything outside this list:

• Faulty or dirty knock sensor on cylinder 10
• Incorrect ignition timing or spark plug issues
• Low-quality or incorrect fuel causing knock
• Carbon buildup inside cylinder 10
• Wiring or connector problems to knock sensor

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Check and replace spark plugs if worn or fouled
2. Inspect and clean or replace knock sensor wiring/connectors
3. Test knock sensor function and replace if faulty
4. Use higher octane fuel to reduce knocking
5. Inspect and clean carbon deposits in cylinder 10

That is what holds for P2345 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.