Wypadanie zapłonów — cylinder 4
P1205
WysokiCylinder 4 Injector Circuit – Open or Short. The engine control module detected an incorrect electrical signal in the fourth cylinder injector circuit.
OBD-II (EN): Cylinder 4 Injector Circuit Open or Short
Code P1205 indicates an electrical problem in the cylinder 4 injector circuit – it could be an open circuit, a short circuit, or a faulty injector. It manifests as rough engine operation, misfires, and increased fuel consumption. Electrical diagnosis of the circuit by a qualified mechanic is recommended, as the source of the problem could be the injector itself, the wiring, or the engine controller.
Symptoms
Check Engine Light on the dashboard. The engine runs unevenly, with a noticeable misfire (shaking) especially at idle. Increased fuel consumption, decreased power and vehicle dynamics. Possible vibrations of the entire body during acceleration. In extreme cases, the engine may not start or may stall while driving.
Possible causes
• Electrically faulty cylinder 4 injector (coil short circuit or open winding) • Damage to the injector power supply wiring harness – chafing, burns, contact corrosion • Damaged or corroded connector plug for cylinder 4 injector • Faulty engine control unit (ECU/ECM) – damaged output signal driver • High resistance or open circuit in the injector ground circuit
Affected systems
Related codes
Obwód wtryskiwacza cyl. 3 — usterka
Obwód wtryskiwacza cyl. 2 — usterka
Obwód wtryskiwacza cyl. 4 — usterka
Wykryto losowe zapłony w wielu cylindrach
Obwód wtryskiwacza cyl. 1 — usterka
Does code P1205 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.
