OBD-II Code P0211 — What It Means & How to Fix It

What Does This Error Mean?

P0211 means the ECM has detected a fault in the fuel injector circuit for cylinder 11. This code only applies to engines with 11 or 12 cylinders — most commonly W12 or flat-12 engines found in luxury and exotic vehicles. The injector may be failing to fire, fire at the wrong time, or have a wiring problem. Symptoms include rough idle, loss of power, engine shaking, and reduced fuel economy.

Affected Models

Audi A8 (W12 engine)
Bentley Continental GT (W12)
Volkswagen Phaeton (W12)
Ferrari flat-12 models
Lamborghini (12-cylinder variants)

Common Causes

Failed fuel injector with a burned or open internal coil on cylinder 11
Damaged wiring or broken connector at the cylinder 11 injector
Short circuit in the injector circuit caused by wiring chafing against metal
Corroded injector electrical connector pins causing high resistance
ECM injector driver circuit failure affecting cylinder 11 output

How to Fix It

Check for additional codes. P0311 (cylinder 11 misfire) appearing alongside P0211 strongly suggests the injector on that cylinder is not firing.

Write down all codes before clearing them — the full code list often tells the story.
Identify the location of cylinder 11 on your specific engine. On a W12, cylinders are arranged in two banks of six. On a flat-12, they run horizontally. Check your repair manual for the cylinder numbering layout.

Cylinder numbering varies by engine configuration — do not guess which cylinder is number 11.
Inspect the injector connector for corrosion, bent pins, or moisture intrusion. Clean with electrical contact cleaner and reconnect firmly.

Even slight moisture inside the connector can cause intermittent injector faults.
Test the injector resistance with a multimeter. Probe across the two injector terminals with the connector unplugged. A good injector reads 10 to 18 ohms.

Compare the reading to the other injectors — they should all read within 1 to 2 ohms of each other.
If injector and wiring test normal, clear the code and retest. Returning codes without obvious cause require professional ECM diagnostics.

On exotic vehicles, always consult a brand specialist before attempting ECM replacement.

When to Call a Professional

W12 and flat-12 engines are extremely complex and often require disassembly to access certain injectors. Professional diagnosis with a noid light and oscilloscope is strongly recommended. These engines are found in high-value vehicles where incorrect repairs can be very costly. Always get a professional second opinion before replacing the ECM.

Frequently Asked Questions

What cars can get a P0211 code?

Only vehicles with 11 or 12-cylinder engines can produce this code. Common examples include Audi and Bentley W12 models, Volkswagen Phaeton W12, and some Ferrari or Lamborghini flat-12 vehicles. If your car has fewer than 11 cylinders, you will never see P0211.

Is P0211 serious?

Yes — a misfiring cylinder on a high-performance engine can damage the catalytic converter within a short time. It also puts extra strain on the remaining cylinders. Do not ignore this code, especially on an expensive engine where repair costs multiply quickly.

Can a dirty injector cause P0211?

A very clogged injector can cause erratic signals that trigger this code. However, the code specifically indicates a circuit fault — an electrical issue — rather than a flow problem. If injector cleaning does not resolve it, test the electrical circuit before replacing the injector.