Injector circuit malfunction — cylinder 4
Where to start
The injector circuit of cylinder four. The same approach: contacts and wiring first.
What the cylinder number gives you
The last digit names the cylinder: 4. That is the most useful thing in this code — it turns a search across the whole engine into a check of one cylinder.
Swap and watch. Move the injector between cylinder 4 and a neighbour, clear the code and drive. If the fault follows the part, the part is to blame. If it stays on cylinder 4, the cylinder is: the injector, compression, a valve. This is the only way to tell one from the other without taking anything apart.
⚠️ This code is about the circuit too. The injector may be perfectly healthy while its connector is not — check the contact before buying parts.
How to put together a report a mechanic will actually read
How the code is built
All codes in «Fuel and air metering: injectors»
How the app helps
CarScan reads this code from your car through an OBD-II adapter, shows whether it is active now or only stored, names the module that reported it, and puts it into a plain-text report for your mechanic.