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Engine knocks

Engine knocks

Stihl · RZ Zero-Turn Mowers

What does Engine knocks mean?

The engine is making a knocking sound during operation. This typically indicates an issue with the oil level or type.

Common Causes

  • Low oil level
  • Using the wrong grade of oil

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the engine oil level and add oil as required.

  2. 2

    Consult the engine operator's manual to ensure you are using the correct grade of oil.

Browse all codes in this manual (9)
Verified technical data. Last updated: April 2026

Related Faults

Brake will not holdBrake will not holdEngine exhaust is blackEngine exhaust is blackEngine runs but mower will not driveEngine runs but mower will not drive
Source: Stihl RZ Zero-Turn Mowers
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