Draft guidance: awaiting Claude spot-check, qualified-mechanic review and named-editor approval. Do not use a fault code alone to replace parts.
P0202: Cylinder 2 injector circuit malfunction
The ECU has detected an electrical fault in the injector circuit for cylinder 2.
What P0202 means
The ECU has detected an electrical fault in the injector circuit for cylinder 2. The injector is one possibility, but so are its connector, wiring, power feed and ECU driver. Do not replace the injector on this code alone, and confirm cylinder numbering from reliable vehicle data.
Can I still drive?
Book diagnosis promptly. A short, gentle drive may be acceptable only when the warning light is steady and the engine behaves normally. Stop safely and seek recovery if the light flashes, the engine misfires badly or stalls, power falls sharply, or there is fuel smell, leakage or heavy smoke.
Symptoms
- Engine-management light, often alongside P0302.
- Rough or uneven idle, vibration and misfire.
- Hesitation, poor acceleration or reduced power.
- Hard starting or stalling; an intermittent wiring fault may cause only an occasional warning.
Common causes
- Electrically failed or out-of-specification cylinder 2 injector.
- Broken, chafed, melted or shorted wiring.
- Loose, wet, corroded or damaged connector or terminals.
- Shared fuse, relay or supply fault, especially if several injector codes appear.
- ECU injector-driver fault after external circuit faults have been excluded.
Safe first checks
- Record all codes and freeze-frame data before clearing them; P0302 or several P020x codes change the diagnostic direction. With the ignition off and engine cool, inspect the cylinder 2 plug and visible harness for poor seating, pin damage, contamination or rubbed insulation. Check only the handbook-specified injector fuse or relay and never increase a fuse rating. Do not loosen high-pressure lines, swap injectors or back-probe an unfamiliar circuit; electrical tests require the correct diagram, rated equipment and manufacturer values.
Typical UK fix cost
Budget about £50–£100 for diagnosis, £100–£300 all-in for a straightforward fuse, connector or wiring repair, or approximately £150–£900 for one injector depending on the system and access. Extensive harness work or a confirmed ECU-driver fault may sit above this range.
Related models
This is a generic OBD-II code used across many makes and models. The exact test thresholds, component layout and repair route vary by engine and manufacturer, so check vehicle-specific technical information before ordering parts.
Related fault codes
- P0200: Injector circuit malfunction
- P0201: Cylinder 1 injector circuit malfunction
- P0203: Injector circuit fault, cylinder 3
- P0204: Injector circuit fault, cylinder 4
Sources
- Pico Technology: injector voltage and current testing
- OBD-Codes: P0202 technical overview
- Bosch Aftermarket: DTC and electrical-circuit diagnosis
A diagnostic trouble code identifies a system or circuit to investigate. It does not prove that a named part has failed. Preserve freeze-frame data and seek a vehicle-specific diagnosis before clearing the code.