P0210 — Fuel injector electrical problem on cylinder 10

The engine control unit detected an electrical issue in the fuel injector circuit for cylinder 10. This usually means the injector is not receiving power or has an open circuit, causing that cylinder to misfire or not fire at all. It can lead to rough running, reduced power, and increased emissions.

Common causes

The cause is almost always one of a few things. Here they are — P0210 rarely comes from anything outside this list:

• Faulty or damaged injector wiring harness
• Defective fuel injector on cylinder 10
• Corroded or loose electrical connector
• Blown fuse or relay for injector circuit
• Faulty engine control module (rare)

Where to start

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

1. Inspect and repair wiring and connectors
2. Test injector resistance and operation
3. Replace faulty fuel injector if needed
4. Check and replace blown fuses or relays
5. Diagnose and repair engine control module if necessary

That is what holds for P0210 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.