Honda Jazz ECU Cylinder 4 Misfire P0304 — Repair Specialist | The Vehicle Check
P0304 on the Honda Jazz — cylinder 4 misfire detected — frequently points to a failed injector or ignition driver on the ECU once mechanical causes have been ruled out. The Vehicle Check repairs Honda Jazz ECU cylinder 4 driver faults at component level. We identify the exact failed MOSFET or driver IC, replace it and return your original ECU repaired, coded and ready to refit.
Ruling Out Mechanical Causes for P0304
Before confirming the ECU is responsible, rotating the coil and plug from cylinder 4 to another cylinder and rechecking is the standard approach. If the misfire stays on cylinder 4, the ECU is controlling cylinder 4 incorrectly — the driver has failed.
Cylinder 4 ECU driver failures are a known failure mode on Honda Jazz models, particularly at higher mileage and on vehicles that have experienced extended periods of weak battery charging.
ECU Repair for Cylinder 4
We bench test the Honda Jazz ECU with particular attention to the cylinder 4 driver outputs. The failed driver is identified, removed and replaced. A full four-cylinder post-repair test confirms the repair before return.
Your vehicle's immobiliser and key coding is preserved throughout the repair.
Post Your ECU to Us
Send your Honda Jazz ECU to The Vehicle Check, Enfield EN3 7PH. We return it repaired in 2 to 3 working days. Call 0203 489 2610.
Send Your Unit Today
The Vehicle Check | Unit 8 Solway Business Centre | Tysoe Street | Enfield | EN3 7PH
📞 0203 489 2610 | 📧 info@thevehiclecheck.co.uk
Nationwide mail-in postal service. All work covered by our repair warranty.