P0204 on SEAT: How to Diagnose & Fix
Injector Circuit/Open - Cylinder 4
2 SEAT models · 2 documented issues · 2 critical · $300-$4,000 repair
P0204 on SEAT by model: symptoms, diagnosis and fix
The 1.6 TDI common-rail engine in Ibiza Mk4/5, Leon Mk2/3 (and across VW Group small diesels) suffers Bosch injector failure typically at 100,000-180,000 km. Symptoms: rough cold start, individual-cylinder misfire, sometimes back-leak overwhelming the rail pressure regulator. Injector copper washers often re-seal poorly after the first removal.
Common Symptoms
- rough cold start
- misfire
- limp mode
- fuel smell
How to Fix
Back-leak test (10 min) confirms diagnosis. Single injector replacement €300-€600 incl. coding. Full set (4) €1,000-€1,800. Use VW 507.00 spec oil and quality diesel from major-brand stations.
The BKD 2.0 TDI Pump-Düse engine in Leon Mk2 (and Golf Mk5, Passat B6, Audi A3 8P) suffers PD injector failure, particularly on long-life servicing. Failure modes: misfire on one cylinder, hard starting, white smoke, sooty exhaust. Often accompanied by cracked cylinder head between #2 and #3 due to local overheating.
Common Symptoms
- misfire cold
- hard start
- white smoke
- rough idle
How to Fix
Single injector replacement €400-€700 incl. coding. Full set (4) €1,400-€2,000. If head crack present, head rebuild adds €1,200-€2,000 more. Use VW 507.00 oil at 10,000 km max, NOT long-life intervals.
P0204 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0204 mean on a SEAT?
P0204 stands for "Injector Circuit/Open - Cylinder 4." This code means the Engine Control Module detected an electrical problem (open circuit or out-of-range resistance) in the fuel injector control circuit for cylinder 4. The ECM controls each injector through its own circuit and monitors it to confirm proper operation. P0204 indicates the computer isn't seeing the expected electrical response from cylinder 4's injector, so that cylinder may not be getting the correct fuel. You'll often notice a misfire, rough running, and a loss of power tied to cylinder 4. On SEAT it is documented across 2 models: Ibiza, Leon.
What are the most common causes of P0204?
The most common causes of P0204 are: Damaged or corroded injector connector at cylinder 4, Open or shorted wiring in the injector control circuit, Failed (electrically open) fuel injector on cylinder 4, Loose or backed-out connector pin, Poor ground or power feed to the injector, Faulty injector driver inside the ECM/PCM, Chafed harness causing intermittent open. The specific cause varies by vehicle.
How much does it cost to fix P0204 on a SEAT?
Published repair estimates on SEAT range from $300 to $4,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0204 on a different make?
View P0204 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.