P03AF on 2014-2019 Volkswagen Golf R (Golf R Mk7, Golf R Mk7.5) — Cylinder 3 Pressure Too High
1 vehicles · 1 makes · $1,500-$4,200 repair
Most Reported On
P03AF is an OBD-II diagnostic trouble code meaning “Cylinder 3 Pressure Too High.” P03AF indicates the engine control module (ECM) has detected that the in-cylinder combustion pressure in cylinder 3 is higher than the expected/plausible range. It is set on engines equipped with in-cylinder pressure sensors (commonly VW/Audi diesel and some direct-injection applications) and typically triggers the EPC/check-engine light; the ECM may deactivate or de-rate the affected cylinder. The fault can be caused by an actual combustion/fueling problem or by a faulty pressure sensor sending an implausible signal. This code is most commonly reported on 2014-2019 Volkswagen Golf R (Golf R Mk7, Golf R Mk7.5), with repair costs ranging from $1,500 to $4,200.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P03AF, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P03AF mean?
P03AF stands for "Cylinder 3 Pressure Too High." P03AF indicates the engine control module (ECM) has detected that the in-cylinder combustion pressure in cylinder 3 is higher than the expected/plausible range. It is set on engines equipped with in-cylinder pressure sensors (commonly VW/Audi diesel and some direct-injection applications) and typically triggers the EPC/check-engine light; the ECM may deactivate or de-rate the affected cylinder. The fault can be caused by an actual combustion/fueling problem or by a faulty pressure sensor sending an implausible signal.
What are the most common causes of P03AF?
The most common causes of P03AF are: Faulty or leaking fuel injector on cylinder 3 delivering excess fuel, Defective or out-of-calibration in-cylinder pressure sensor (implausible signal), Wiring, connector, or harness fault to the cylinder 3 pressure sensor, Mechanical engine fault (head gasket leak, carbon buildup, bent valve, or compression abnormality), ECM software/calibration error falsely recording high cylinder pressure (known VW/Audi issue, fixed by software update), Worn or faulty spark/glow plug affecting combustion in cylinder 3. The specific cause varies by vehicle.
How much does it cost to fix P03AF?
Repair costs for P03AF range from $1,500 to $4,200, depending on the vehicle and root cause.
Which vehicles are affected by P03AF?
Au7o has documented P03AF across 1 vehicle models from 1 manufacturers: Volkswagen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.