The Quick Answer above is the generic definition. What follows is what is documented for the Ford models that log P0203, checked against manufacturer data and owner reports.
DTC/P0203·Ford
P0203 on Ford: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Ford
P0203 on a Ford 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 3 fuel injector. The injector itself may be fine while the wiring, connector, or ECU driver is at fault. Left unrepaired it causes a cylinder 3 misfire. Typical repair runs about 60 to 350 EUR depending on whether it is wiring or a replacement injector.
Repair cost on Ford€5 - €700
Connect any standard Bluetooth OBD2 adapter to your Ford and Skanyx tells you what P0203 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.
Get Skanyx freeWhat does P0203 mean on a Ford?
Ford Focus
2005-2024On EcoBoost petrol engines the cylinder 3 injector harness routes near the hot exhaust side and chafing or heat damage to the wiring is a common cause of P0203. The 1.5 and 2.0 TDCi diesels use common-rail injectors that are pricier and benefit from injector correction values after replacement, which a workshop or brand tool handles.
What causes P0203 on a Ford?
Beyond the generic causes listed on the main P0203 page, these are the documented Ford-specific patterns:
Ford FocusHeat-damaged or chafed injector wiring on EcoBoost petrol
Ford FocusCommon-rail injector failure on TDCi diesel
How to diagnose P0203 on a Ford with OBD2
Follow these steps to pinpoint the root cause of P0203:
- Read the stored code and freeze frame with Skanyx to confirm it is P0203 and note the conditions (RPM, load, coolant temp) when it set
- Check for companion misfire codes (P0300 or P0303) which point to a genuine combustion problem on cylinder 3
- Inspect the cylinder 3 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 P0203 cost to fix on a Ford? (EUR)
Estimated repair costs for P0203 in EUR, compiled across makes. Ford costs typically sit in the middle of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0203 on Ford
These codes commonly cluster with P0203 on Ford vehicles:
Looking for the full P0203 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0203 guideSkanyx · Ford
Diagnose P0203 on your Ford
Your car logged P0203. Skanyx reads it on any standard Bluetooth OBD2 adapter, tells you whether it is safe to keep driving, and shows the €5-€700 repair range so you know the number before a shop quotes you. Free on iPhone and Android, and you do not need to be a mechanic to read it.
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