P0203 on Audi
Injector Circuit/Open - Cylinder 3
P0203 on Audi vehicles indicates injector circuit/open - cylinder 3. Au7o has documented this code across 1 Audi model — most commonly on A3. 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 3. The ECM pulses each injector electrically and watches the circuit to verify it is operating. P0203 means the expected feedback for cylinder 3's injector is missing or abnormal, so that cylinder may not be fueling properly. The typical result is a misfire, rough idle, and reduced performance traceable to cylinder 3. Typical repair costs on Audi range from $400 to $2,000, depending on the specific model and root cause.
Common Causes of P0203
- •Damaged or corroded injector connector at cylinder 3
- •Open or shorted wiring in the injector control circuit
- •Failed (electrically open) fuel injector on cylinder 3
- •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
P0203 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.
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View P0203 across all makes →Frequently Asked Questions
What does P0203 mean on Audi?▼
P0203 stands for "Injector Circuit/Open - Cylinder 3." 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 3. The ECM pulses each injector electrically and watches the circuit to verify it is operating. P0203 means the expected feedback for cylinder 3's injector is missing or abnormal, so that cylinder may not be fueling properly. The typical result is a misfire, rough idle, and reduced performance traceable to cylinder 3. On Audi specifically, this code is documented across 1 model.
What causes P0203 on Audi vehicles?▼
Common causes on Audi: Damaged or corroded injector connector at cylinder 3, Open or shorted wiring in the injector control circuit, Failed (electrically open) fuel injector on cylinder 3, 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 P0203 on a Audi?▼
Repair costs on Audi range from $400 to $2,000, depending on the specific model and root cause.
Which Audi models have P0203 documented?▼
Au7o has documented P0203 on 1 Audi model: A3.