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2022 Pilot Rough Idle & Check Engine Light - P030x Code

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Diana O. · rep 0 · May 22, 2:46 AM · 1 replies · solved · Question

Vehicle: 2022 Honda Pilot Touring

My 2022 Honda Pilot Touring, with around 45,000 miles, recently started running a bit rough, especially at idle. The check engine light came on, and when I hooked up my OBD scanner, it showed a P0301 code (Cylinder 1 Misfire).

I'm thinking it might be a spark plug or ignition coil issue, given the mileage. Is this something that's common for the Pilot at this mileage? What's the recommended spark plug change interval for this engine, and are there any specific brands or types of plugs recommended for Honda?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:46 AM

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ClearTheCode admin answer:

A P0301 code indicating a Cylinder 1 Misfire, accompanied by a rough idle and check engine light, is a clear diagnostic starting point. While 45,000 miles is a bit early for spark plug failure on modern iridium plugs, it's not impossible, and other components could be at play.

Here's a breakdown of common causes and diagnostic steps:

  1. Spark Plug: A fouled, worn, or damaged spark plug in cylinder 1 is a primary suspect. Honda typically uses long-life iridium spark plugs, with a recommended replacement interval often around 100,000 miles. However, a single plug can fail prematurely.
  2. Ignition Coil: The ignition coil for cylinder 1 could be failing. This is a very common cause of misfires. You can often swap the coil from cylinder 1 with a coil from another cylinder (e.g., cylinder 3) and see if the misfire code moves (e.g., to P0303). If it does, the coil is bad.
  3. Fuel Injector: A clogged or faulty fuel injector for cylinder 1 can prevent proper fuel delivery, leading to a misfire. This is less common but possible.
  4. Compression Issue: In rarer cases, a mechanical issue like a burnt valve or head gasket problem could cause low compression in cylinder 1, leading to a misfire. This would typically be accompanied by other symptoms.

Recommended Spark Plugs: For Honda vehicles, it's highly recommended to use OEM-equivalent iridium spark plugs from brands like NGK or Denso. These are the original equipment manufacturers for Honda and ensure proper performance and longevity.

DIY Steps:

  • Inspect/Replace Spark Plug: Access cylinder 1's spark plug, inspect its condition, and replace if necessary.
  • Swap Ignition Coil: As mentioned, swap the coil to confirm if it's the issue.

When to see a shop:

  • If swapping the coil doesn't move the misfire code.
  • If you've replaced the spark plug and coil, and the misfire persists.
  • If you suspect a fuel injector issue, as this requires specialized tools for testing and replacement.
  • If you suspect a compression issue, as this requires a compression test and potentially more invasive engine work.
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