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P1202

Cylinder 2 Injector Circuit Open/Shorted.

  • Jaguar
  • 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 a Jaguar, P1202 means the engine control module has detected an open circuit or short in the fuel injector circuit for cylinder 2. The module monitors the injector driver and its feed or earth, and sets the code when the electrical behaviour does not match what it expects. The cylinder may then be starved of fuel or receive the wrong amount.

Symptoms

  • Malfunction indicator lamp on
  • Rough idle or a noticeable misfire on one cylinder
  • Hesitation or loss of power under acceleration
  • Hard starting or extended cranking
  • Poor fuel economy
  • Fuel smell from the exhaust

Possible causes

  • Faulty cylinder 2 fuel injector with an open or shorted coillikely
  • Damaged, chafed or corroded wiring between the injector and the engine control modulelikely
  • Loose, corroded or poorly seated injector electrical connectorlikely
  • Poor power supply or earth affecting the injector circuit, such as a fault in a relay or fuse feed (depends on model and engine)possible
  • Moisture or oil contamination inside the harness or connectorpossible
  • Faulty injector driver within the engine control modulerare

How to diagnose

  1. Read all stored and pending codes and record the freeze frame data, noting engine speed, load and temperature when the fault set.
  2. Check for other injector, misfire or fuel trim codes that could point to a shared feed or earth fault.
  3. Visually inspect the cylinder 2 injector connector and nearby harness for damage, corrosion, oil contamination, heat damage or chafing.
  4. Unplug the injector connector and measure the injector coil resistance, comparing it with the specification for the specific engine.
  5. With the ignition on, check the injector connector for the correct supply voltage and a good earth path, following the wiring diagram for the model.
  6. Check the circuit for continuity and for shorts to earth or to supply between the injector connector and the control module connector.
  7. Swap the cylinder 2 injector with another cylinder if practical and see whether the fault follows the injector.
  8. Only if all wiring and the injector test fine, check the control module's driver output and consider module diagnosis.

How to fix

  • Replace the cylinder 2 injector if its resistance is out of specification or it fails electrical testing.
  • Repair or replace damaged wiring, using proper soldered or crimped and sealed repairs.
  • Clean, repair or replace a corroded or loose injector connector or terminals.
  • Restore the correct supply or earth by repairing the relay, fuse feed or earth connection concerned.
  • Repair or replace the engine control module only after confirming the fault is internal to it, then clear the code and road test.

Can I keep driving?

Medium severity

Short, gentle journeys are possible, but the car may run poorly and unburnt fuel can overload the catalytic converter, so get it checked soon. Avoid heavy loads and high revs if it is misfiring.

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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