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2018 S60 T5 Check Engine Light - Rough Idle and P0301 Code

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Amanda S. · rep 0 · May 22, 5:10 AM · 1 replies · solved · Question

Vehicle: 2018 Volvo S60 T5

Hey everyone,

My 2018 Volvo S60 T5, with about 75,000 miles, recently started acting up. The check engine light came on, and the car has a noticeable rough idle, especially when cold. It feels like it's misfiring.

I hooked up my OBD-II scanner, and it's throwing a P0301 code, indicating a misfire in cylinder 1. I'm wondering if this is a common issue for this model year or if there's a specific component I should check first before taking it to a shop. I've heard about potential ignition coil problems on some Volvos.

Any advice on troubleshooting steps or common culprits for a P0301 on a 2018 S60 T5 would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:10 AM

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ClearTheCode admin answer:

The P0301 code (Cylinder 1 Misfire Detected) on your 2018 Volvo S60 T5 is a common diagnostic indicator. Here's a structured approach to diagnose and resolve it:

  1. Check Spark Plugs and Ignition Coils:

    • Cause: Worn spark plugs or a failing ignition coil are the most frequent causes of misfires. Cylinder 1's coil or plug could be faulty.
    • Action: Inspect the spark plug for cylinder 1 for fouling or wear. You can also swap the ignition coil from cylinder 1 with another cylinder (e.g., cylinder 2) and see if the misfire code moves to the new cylinder (P0302). If it does, the coil is the culprit.

  2. Inspect Fuel Injector:

    • Cause: A clogged or faulty fuel injector for cylinder 1 can prevent proper fuel delivery, leading to a misfire.
    • Action: While harder to diagnose without specialized tools, a mechanic can test injector pulse and spray pattern. Sometimes, a fuel system cleaner can help with minor clogs.

  3. Check for Vacuum Leaks:

    • Cause: Unmetered air entering the engine can lean out the air/fuel mixture, causing misfires, especially at idle.
    • Action: Listen for hissing sounds around the intake manifold and vacuum lines. A smoke test performed by a shop can pinpoint small leaks.

  4. Engine Compression Test:

    • Cause: Low compression in cylinder 1 (due to issues like a bad valve, head gasket, or piston rings) will definitely cause a misfire.
    • Action: This requires a compression tester. If compression is significantly lower than other cylinders, it indicates a more serious internal engine issue.

When to See a Shop: If swapping coils doesn't resolve the issue, or if you're uncomfortable performing these checks, it's best to take your Volvo to a qualified technician. They have advanced diagnostic tools to test fuel pressure, injector function, and perform comprehensive engine diagnostics. Ignoring a persistent misfire can lead to catalytic converter damage over time.

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