P0204 on Audi
Injector Circuit/Open - Cylinder 4
P0204 on Audi vehicles indicates injector circuit/open - cylinder 4. Au7o has documented this code across 2 Audi models — most commonly on A3, R8. 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. Typical repair costs on Audi range from $400 to $4,000, depending on the specific model and root cause.
Common Causes of P0204
- •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
P0204 on Audi by Model
Audi A3(1 issue)
- Diesel Injector Failure2010-2015
The Bosch piezo common-rail diesel injectors can fail or develop deposits, causing rough running, misfires, and poor fuel economy. Injector seals can also leak. OEM injector: VW/Audi 03L130277 (also 03L130277A), Bosch reference 0445116030. These are Bosch piezo-type injectors used across CBEA and CJAA engine codes. 4 injectors per engine.
Audi R8(1 issue)
- Direct-Injection Fuel Injector Failure2008-2023
The FSI direct-injection injectors shared across the VAG family (Audi/VW/Porsche) are a documented R8 failure point. Injectors can stick open or closed; a stuck-open injector dumps raw fuel into the cylinder and can wash down the bore, while a stuck-closed injector starves the cylinder. One well-known r8talk case had 6 of 8 injectors fail on a 2008 V8 at only 14,000 miles. Symptoms overlap with coil failure (misfires), so proper diagnosis is important, and carbon buildup on the injector tips is a contributing factor.
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View P0204 across all makes →Frequently Asked Questions
What does P0204 mean on Audi?▼
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 Audi specifically, this code is documented across 2 models.
What causes P0204 on Audi vehicles?▼
Common causes on Audi: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0204 on a Audi?▼
Repair costs on Audi range from $400 to $4,000, depending on the specific model and root cause.
Which Audi models have P0204 documented?▼
Au7o has documented P0204 on 2 Audi models: A3, R8.