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P0311 Generic (SAE) Basic entry

Cylinder 11 Misfire Detected

Updated 2026-10-02 · Ignition system & misfires

Severity
High
Typical repair cost
60 – 900 EUR
System
Powertrain

What it means

P0311 is stored when the crankshaft sensor detects the small speed drops that occur when a cylinder fails to fire. The misfire counter for Cylinder 11 Misfire exceeded the threshold within the monitored period.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

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Symptoms

  • Flashing or steady check engine light
  • Engine shaking, especially at idle
  • Loss of power under load
  • Fuel smell from the exhaust
  • Risk of catalytic converter damage if ignored

Common causes

  1. Worn spark plugs or a failing ignition coil
  2. Clogged or leaking fuel injector
  3. Vacuum leak at the intake manifold or gaskets
  4. Low compression: valve, piston ring or head gasket problem
  5. Faulty crankshaft or camshaft sensor giving false misfire counts

How to diagnose

  1. Read misfire counters per cylinder with a scan tool to confirm which cylinder is affected
  2. Inspect the spark plug for wear, fouling and correct gap
  3. Swap the ignition coil with a neighbouring cylinder and check whether the misfire follows
  4. Check injector operation (noise, resistance, balance test) and fuel pressure
  5. Perform a compression or leak-down test if ignition and fuel are good
  6. Smoke test the intake for vacuum leaks

Frequently asked questions

Can I keep driving with P0311?

Not for long. This code can lead to expensive follow-up damage or affects safety systems; have it checked as soon as possible.

Will clearing P0311 fix it?

No. Clearing only erases the stored code; it returns as soon as the monitor runs again unless the cause is repaired.

Related codes

P0309P0310P0312P0313

Nearby codes in this group