Kawasaki DFI Code 42: Fuel Injector — Fix
On Kawasaki motorcycles and scooters, DFI service code 42 means a fault in the fuel injector circuit — the ECU isn’t driving an injector correctly.
- Applies to
- Kawasaki motorcycles
- Est. repair cost
- $25 – $220
- Time to fix
- 30–90 minutes
What it means
Look for a loose/corroded injector connector, damaged wiring, or a clogged or electrically failed injector. This is a Kawasaki DFI (Digital Fuel Injection) service code, read through the FI light or the bike’s service/diagnostic mode. It applies to Kawasaki FI models such as the Ninja, Z, Versys, and ZX range. Note: Kawasaki service-code numbers can vary by model — confirm against your manual. After the fault is repaired the code is kept as a stored "history" code; clear it through Kawasaki’s service/diagnostic mode.
Symptoms
- FI light on with service code 42
- Misfire, rough idle, or no start
- Fuel smell, power loss
How to fix it
- 1
Inspect the injector connector and wiring
1. Unplug and check the injector connector for corrosion. 2. Inspect the harness and reseat firmly.
- 2
Test, clean, or replace
1. Measure the injector coil resistance against spec. 2. Clean a partly clogged injector or replace a failed one, then clear the code.
Frequently asked questions
Will injector cleaner fix code 42?
Only a partial clog. An electrical fault (open/short in the injector or wiring) needs the connector, harness, or injector repaired.
Last updated July 16, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.