P0202: Injector Circuit Open - Cylinder 2

P0202: Injector Circuit Open - Cylinder 2

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P0202: Injector Circuit Open - Cylinder 2 Could Cost You Big Time

Look - when your OBD2 code reads P0202, it means there's an open circuit in the injector for cylinder 2. This isn't just a hiccup; it can lead to poor engine performance, increased emissions, and even engine damage if not addressed quickly. If you think throwing a new injector at it will solve the problem, think again. You need to diagnose the root cause before swapping parts.

Injector issues can stem from wiring problems, connector issues, or even a faulty Engine Control Module (ECM). The trick is to rule out the simple stuff first before diving into expensive repairs. Use the Mobile Master Mechanic app for VIN-specific guidance to pinpoint the issue in your particular vehicle.

Symptoms

  • Engine misfires or runs rough
  • Check Engine Light illuminated
  • Loss of power, especially under acceleration
  • Increased fuel consumption
  • Unusual smells from the exhaust
  • Rough idle or stalling
  • Engine may not start
  • Audible clicking or buzzing from the injector area

Diagnostic order

  1. Check for any blown fuses related to the fuel injector circuit (fuse ratings vary, usually 10-20 amps).
  2. Inspect the wiring harness and connectors for signs of damage or corrosion.
  3. Measure the resistance of the injector; it should typically be between 12-16 ohms. If it's out of this range, replace the injector.
  4. Check the voltage at the injector connector while cranking the engine; it should be around 12 volts.
  5. If all else fails, test the ECM for faults or programming issues.

Common questions

  • What does it mean if I get P0202?

    It means there's an open circuit in the injector wiring for cylinder 2, preventing it from receiving the signal it needs to operate.

  • Can I drive my car with this code?

    Not recommended. It can lead to further engine damage and poor performance.

  • How do I check if the injector is bad?

    Measure the resistance across the injector terminals; if it’s out of the 12-16 ohm range, it's likely faulty.

  • What tools do I need to diagnose this issue?

    A multimeter, basic hand tools, and possibly an OBD2 scanner for reading codes.

  • Is it safe to replace just the injector?

    No. Make sure to diagnose the underlying issue first; it could be wiring or ECM related.

  • How much does it cost to fix this?

    Costs can vary widely, but diagnostics might run $100-$150, and parts can range from $50 to $300.

  • Can this happen in other cylinders?

    Yes, similar codes like P0201 or P0203 indicate issues in other cylinders.

  • How often does this issue occur?

    It can occur in vehicles with high mileage or poor maintenance history, typically over 100,000 miles.

Vehicle-specific notes

  • Ford EcoBoost (1.5/2.0/2.3/3.5L): Look for wiring issues near the turbo due to heat exposure.
  • Honda K-series 2.0/2.4: Common for harness wear due to engine movement; check for fraying.
  • Toyota 2GR-FE V6: Known for injector connector corrosion; inspect closely.
  • GM 2.4 Ecotec: Poor fuel quality can lead to injector fouling; use top-tier gasoline.
  • GM 3.6 LFX: ECM issues can mimic injector problems; run a complete diagnostic.
  • Chrysler 3.6 Pentastar: Watch for wiring harness issues near the intake manifold.
  • BMW N20/N54/N55: Injector coding may be required after replacement.
  • VW/Audi 2.0T TSI: Use OEM injectors; aftermarket can lead to compatibility problems.
  • Subaru EJ20/FA20: Check for leaks in the fuel rail that may affect injector performance.
  • Nissan VQ35/VK56: Injector issues are common with high mileage; inspect the entire fuel system.

Parts and cost ranges

  • Fuel Injector: $50 - $300 each
  • Wiring Harness: $30 - $150
  • ECM: $200 - $1,000 (if needed)
  • Fuses: $5 - $20
  • Labor: $100 - $150 per hour

What people get wrong

  • Assuming the injector is bad without checking wiring first.
  • Replacing the injector without testing the ECM.
  • Neglecting to check for blown fuses.
  • Not using the right tools for diagnostics, leading to misdiagnosis.
  • Overlooking signs of corrosion in the connectors.

Related codes

If you’re running into P0202, you might also want to check out P0201, P0203, and P0204, which indicate similar injector circuit issues in other cylinders.

Stop throwing parts at your car. The Mobile Master Mechanic app walks you through the exact diagnostic for YOUR specific VIN - engine, year, trim, even mileage-specific known issues. Free download.

-- Hank, Master Mechanic at Mobile Master Mechanic

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