P0293 — Cylinder 11 is not firing or contributing properly

The engine control module detected that cylinder 11 is not producing power as expected, causing imbalance in engine performance. This can happen due to misfires, fuel delivery issues, ignition problems, or mechanical faults in that cylinder.

Common causes

The cause is almost always one of a few things. Here they are — P0293 rarely comes from anything outside this list:

• Faulty spark plug or ignition coil on cylinder 11
• Fuel injector malfunction or clog on cylinder 11
• Compression loss in cylinder 11 due to mechanical damage
• Wiring or connector issues affecting cylinder 11 components
• Vacuum leak or intake problem near cylinder 11

Where to start

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

1. Scan for related misfire codes and inspect ignition components
2. Check and clean or replace fuel injector for cylinder 11
3. Test compression on cylinder 11 to rule out mechanical issues
4. Inspect wiring and connectors for damage or corrosion
5. Replace faulty spark plug or ignition coil if needed

That is what holds for P0293 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.