P0204 means the engine control unit detected an electrical fault (open circuit, short, or out-of-range resistance) in the wiring or driver for the cylinder 4 fuel injector. The injector itself may be fine while the wiring, connector, or ECU driver is at fault. Left unrepaired it causes a cylinder 4 misfire. Typical repair runs about 60 to 350 EUR depending on whether it is wiring or a replacement injector.
DTC/P0204·BMW
P0204 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)BMW
P0204 on a BMW means the engine control unit detected an electrical fault (open circuit, short, or out-of-range resistance) in the wiring or driver for the cylinder 4 fuel injector. The injector itself may be fine while the wiring, connector, or ECU driver is at fault. Left unrepaired it causes a cylinder 4 misfire. Typical repair runs about 60 to 350 EUR depending on whether it is wiring or a replacement injector.
Repair cost on BMW€7 - €980
What does P0204 mean on a BMW?
BMW 3 Series
2005-2024Direct-injection petrol engines (N20, N52, N55, B48) use solenoid or piezo injectors with connectors that can corrode or work loose. On N47/B47 diesels the common-rail injectors are costly and need injector coding after replacement, which requires Carly, ISTA, or a workshop. Skanyx reads the generic circuit code and any misfire codes, but not the per-injector adaptation data.
What causes P0204 on a BMW?
Beyond the generic causes listed on the main P0204 page, these are the BMW-specific patterns we see most often:
BMW 3 SeriesCorroded or loose injector connector on N20/B48 petrol
BMW 3 SeriesDiesel common-rail injector failure requiring coding on N47/B47
How to diagnose P0204 on a BMW with OBD2
Follow these steps to pinpoint the root cause of P0204:
- Read the stored code and freeze frame with Skanyx to confirm it is P0204 and note the conditions (RPM, load, coolant temp) when it set
- Check for companion misfire codes (P0300 or P0304) which point to a genuine combustion problem on cylinder 4
- Inspect the cylinder 4 injector connector and harness for corrosion, looseness, melted pins, or chafing
- With the engine off, measure the injector winding resistance with a multimeter and compare against the workshop spec (most petrol injectors read roughly 12-17 ohms)
- Check for the injector control and supply circuits with a multimeter or test light, and swap the suspect injector to another cylinder to see if the fault follows it
- Note that per-injector coding, flow balance, and quantity-correction values are not on generic OBD2 - read those with a brand tool such as Carly, OBDeleven, or XENTRY, or have a workshop verify them
How much does P0204 cost to fix on a BMW? (EUR)
Estimated repair costs on a BMW (BMW parts and labour typically run 40% above the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0204 on BMW
These codes commonly cluster with P0204 on BMW vehicles:
FAQ: P0204 on BMW
Does P0204 mean the injector is bad?
Not necessarily. P0204 is an electrical circuit fault for cylinder 4, and the wiring, connector, or ECU driver is at fault just as often as the injector itself. Check the connector and harness before buying a new injector.
Can I drive with a P0204 code?
For a short distance, yes, but you should not. A dead cylinder 4 injector causes a misfire that pushes unburnt fuel into the exhaust and can overheat and ruin the catalytic converter. Fix it promptly to avoid a far bigger bill.
How do I know if it is the wiring or the injector?
Measure the injector resistance and compare it to spec, then inspect and wiggle-test the connector and harness. If resistance is in spec and the wiring is clean, suspect the circuit or ECU driver. Swapping the injector to another cylinder shows whether the fault moves with the part.
Will a bad injector cause a misfire code too?
Often yes. A cylinder 4 injector that stops delivering fuel triggers a misfire, so you may also see P0300 (random) or P0304 (cylinder 4) stored alongside P0204.
Is it cheaper to clean an injector than replace it?
Cleaning helps a clogged or dirty injector, but P0204 is an electrical fault, not a flow problem, so cleaning rarely fixes it. The fix is repairing the circuit or replacing a failed injector.
Looking for the full P0204 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0204 guideSkanyx · BMW
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