P0202

Universal

Injector Circuit Malfunction - Cylinder 2

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The engine computer controls the fuel injector for cylinder 2 to meter fuel into that cylinder. P0202 means it detected an electrical problem in that injector’s circuit; it does not by itself prove the injector needs replacement. The fault may cause rough running, a misfire, reduced power, or no obvious symptoms, depending on how often the circuit problem occurs.

Report an error with this code

⚠️ Before You Begin (Safety First)

If the engine is shaking severely, the malfunction indicator light is flashing, or you notice fuel leaking or a strong fuel smell, stop driving and arrange professional help. A persistent misfire can damage the emissions system. Avoid touching wiring or components near a hot or running engine.

Common Symptoms

  • The malfunction indicator light may turn on when the engine computer detects the circuit problem.
  • Rough idle or engine misfire may occur if cylinder 2 receives too little or no fuel because the injector circuit is interrupted.
  • Reduced power or hesitation may occur if the engine is not contributing normally on cylinder 2.
  • Fuel economy or exhaust emissions may worsen if the fault disrupts fuel delivery.
  • There may be no noticeable symptoms if the fault is intermittent or has little effect on engine operation.

Common Causes

  • A loose, damaged, or corroded connection at the cylinder 2 injector or its wiring.
  • An open or short in the wiring between the injector and engine control circuit.
  • An electrical fault within the cylinder 2 injector.
  • A fault in the engine computer’s injector control circuit, which should be considered after the wiring and injector are tested.

Diagnostic Steps

  1. Note when the warning light appeared and whether the engine runs roughly, loses power, or has trouble starting; this information can help guide diagnosis.
  2. With the engine off and cool, visually inspect accessible wiring and the cylinder 2 injector connector for obvious damage, corrosion, or a connector that appears loose. Do not pull on wires or force the connector.
  3. Look for signs of fuel leakage or a strong fuel smell. If present, do not start or drive the vehicle; arrange professional assistance.
  4. If you have a scan tool, record the codes and available related data before clearing anything. Use the vehicle-specific service information to identify cylinder 2 and avoid replacing parts based on the code alone.
  5. Leave electrical circuit testing and injector removal to a qualified technician if you are unsure of the correct vehicle-specific procedure.

When to Call a Professional

Confirm the code and check related codes and available misfire data before replacing parts. A technician can inspect the cylinder 2 injector connector and harness, then test the injector and control circuit using vehicle-specific service information and suitable electrical test equipment. The code identifies a detected circuit condition, not its cause.

Compare component listings

Confirm diagnosis and vehicle fitment before buying. A listing does not prove that a part needs replacement. We may earn a commission from qualifying purchases.

Search Amazon Search eBay

Commonly Asked Questions

Does P0202 prove the cylinder 2 injector is faulty?

No. It indicates a detected problem in the cylinder 2 injector circuit. The injector, its connector or wiring, and the control circuit need to be checked to find the cause.

Is P0202 the same as a cylinder 2 misfire code?

No. P0202 identifies an injector-circuit malfunction. A misfire may result if fuel delivery is affected, but the circuit code does not by itself establish that a misfire occurred.

Can I keep driving with P0202?

A vehicle with no noticeable running problem may be driven only as needed to reach a safe place or repair facility, but prompt diagnosis is advisable. Stop if the engine shakes severely, the warning light flashes, or fuel is leaking or smells strongly.

Should I replace the injector first?

Not without diagnosis. A poor connection or damaged wiring can produce the same circuit code, so the connector, harness, injector, and control circuit should be evaluated before parts are replaced.

Browse Available Code Guides

Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.