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P1202

Cylinder 2 Misfire.

  • Honda
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
2
AreaFuel and air metering (injector circuit)
02
FaultThe specific fault in that area

What it means

On Honda, P1202 means the engine control unit has detected a misfire on cylinder 2. It sets when crankshaft speed analysis shows cylinder 2 is not contributing its share of power, so combustion in that cylinder is incomplete or absent. The cause can be ignition, fuel, air or mechanical, and it varies by model and engine.

Symptoms

  • Rough or uneven idle, often with a noticeable shake
  • Flashing or steady engine warning light
  • Hesitation or loss of power under acceleration
  • Smell of unburnt fuel from the exhaust
  • Poor fuel economy
  • Hard or extended starting

Possible causes

  • Worn, fouled or incorrectly gapped spark plug on cylinder 2likely
  • Faulty ignition coil or coil connector on cylinder 2likely
  • Fuel injector on cylinder 2 blocked, leaking or not operatingpossible
  • Vacuum leak or intake gasket leak affecting cylinder 2possible
  • Damaged wiring or poor connection to the coil or injectorpossible
  • Low compression on cylinder 2 (valve, piston ring or head gasket problem)rare
  • Outdated control unit software where a known fault exists for the specific modelrare

How to diagnose

  1. Read all stored and pending codes and freeze frame data to see load, rpm and engine temperature at the time of the misfire
  2. Check for other misfire or fuel trim codes to tell a single-cylinder fault from a general one
  3. Inspect the cylinder 2 coil, connector and wiring for damage, oil, moisture or looseness
  4. Remove and inspect the cylinder 2 spark plug, and compare its condition and gap with the specification for the engine
  5. Swap the cylinder 2 coil with another cylinder, clear the code and see whether the misfire follows the coil
  6. Check the cylinder 2 injector operation, using a resistance test and listening or pulse checks
  7. Smoke test or inspect the intake for vacuum leaks around the cylinder 2 runner
  8. Carry out a compression or leak-down test on cylinder 2 if ignition and fuel are proven good

How to fix

  • Replace the spark plugs, or at least the cylinder 2 plug, with the correct type and gap
  • Replace the faulty ignition coil
  • Clean or replace the cylinder 2 fuel injector, or repair its wiring
  • Repair intake leaks by replacing leaking gaskets or hoses
  • Repair or replace damaged wiring and connectors
  • Repair the internal engine fault if compression is low, following the model-specific procedure

Can I keep driving?

Medium severity

Short, gentle trips are possible, but get it fixed soon. If the warning light flashes, reduce load and stop driving as soon as it is safe, as raw fuel can damage the catalytic converter.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

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