P0204 on Audi: Symptoms, Causes & Fix
Official technical diagnostic wire for fault code P0204 specifically affecting Audi vehicles (A4, A6, Q5, Q7, A3).
Select Your Audi Model for P0204:
1. Common Symptoms on Audi Vehicles
When Audi Engine Control Modules (ECM) trigger fault code P0204, drivers typically report:
2. Root Causes on Audi Engines
Historical diagnostic claims across Audi engines point to the following failure distribution:
3. Step-by-Step Fix Protocol for Audi
Measure resistance across pins (12–16 ohms). on Audi engines.
Check that ECM pulse reaches the connector. on Audi engines.
Replace the faulty injector with OEM unit. on Audi engines.
Clear DTC memory and confirm smooth operation. on Audi engines.
Equipment for Diagnosing Audi (P0204)
Audi OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Audi.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
4. Audi P0204 Frequently Asked Questions
What does code P0204 mean on a Audi?
On Audi vehicles, P0204 indicates that the Engine Control Module (ECM) detected injector circuit malfunction - cylinder 4. This typically points to Faulty Cylinder 4 fuel injector or Broken wiring harness.
Can I continue driving my Audi with code P0204?
No. Cylinder 4 is disabled, causing rough running and unburned fuel delivery issues. Because this code carries a Critical severity rating on Audi powertrains, we recommend scanning live data values promptly to prevent secondary damage.
How much does it cost to fix code P0204 on a Audi?
Estimated DIY parts cost ranges from $150 - $550 (DIY: $40 - $180), while professional shop repairs at an authorized Audi dealership or independent specialist typically range from $180 to $380 including diagnostic labor.