P207F vs P20EE: AdBlue Quality Warning or SCR Efficiency Fault?
P207F signals poor AdBlue quality or dosing issues; P20EE means the SCR system isn’t reducing NOx emissions efficiently—often due to sensor, injector, or catalyst problems. Both can trigger a countdown to engine lockout. Fix P207F first for best results.
Two of the most common AdBlue codes across modern diesel vans and cars are P207F and P20EE. They often appear together but have different root causes. Here’s how to tell them apart, what triggers each, and the fastest way to clear both for good.
P207F vs P20EE: Side-by-Side Comparison
| Code | Meaning | Main Cause | Typical Fix | Urgency |
|---|---|---|---|---|
| P207F | Reductant Quality Performance | AdBlue quality, dosing, or contamination | Drain/refill AdBlue, sensor recalibration | High – triggers countdown |
| P20EE | SCR NOx Catalyst Efficiency Below Threshold | NOx sensor, injector, or catalyst fault | Sensor or injector replacement, SCR cleaning | High – triggers countdown |
What Triggers Each Code?
- P207F – The ECU detects poor-quality AdBlue, contamination, or inconsistent dosing. Often caused by old fluid, water/fuel contamination, or sensor miscalibration after jump-starts or cold weather.
- P20EE – The SCR system isn’t reducing NOx emissions. Common causes: failed NOx sensor, blocked injector, catalyst contamination, or dosing module faults.
Symptoms to Watch For
- “AdBlue Quality Poor” or “No Start in 500 miles” countdown
- Both codes stored in ECU memory
- Increased AdBlue consumption
- Reduced performance or restricted torque
- NOx sensor voltage out of range
Which Code Should You Fix First?
Use live data from a diagnostic tool to check NOx conversion rate and reductant quality before repairs.
How Our Mobile Team Fixes P207F & P20EE
- Full SCR system scan using OBD diagnostics
- NOx sensor and dosing pump live data check
- AdBlue drain/refill and injector cleaning if needed
- NOx sensor replacement and SCR recalibration
- AdBlue reset or delete (where permitted)
- NOx sensor circuit review for voltage drift
No cutting or drilling—just safe, reversible software or targeted hardware fixes.
How Long Does It Take?
Most faults are fixed in under an hour. For severe crystallisation or failed sensors, we confirm the cause before any parts are ordered—saving you time and money.
Real Case: Peugeot Boxer 2.0 BlueHDi
Recently, a Peugeot Boxer showed both codes. The AdBlue fluid was fine, but a failed upstream NOx sensor caused the issue. After sensor replacement and recalibration, both P207F and P20EE cleared instantly.
Related Faults & Resources
- Peugeot P20EE Fault Code Fix
- Peugeot AdBlue Tank Fault – Fast Mobile Fix
- P207F – Ford Transit AdBlue Quality Performance Fix
- NOx Sensor Delete & Bypass Guide
- What to Do If Your Car Won’t Start Due to AdBlue Issues
Can You Keep Driving?
Yes, but only for a limited distance. Both codes trigger a 500–700 mile countdown to engine lockout. Delaying repairs can also damage the SCR catalyst. Book a check as soon as possible.
Prevention Tips
- Use high-quality AdBlue from sealed containers
- Keep the tank cap tight
- Run the engine long enough to heat the SCR system
- Annual AdBlue system checks, especially before winter
Mobile Help, Same-Day Fix
We offer mobile AdBlue repair across Stafford, Crewe, Newcastle-under-Lyme, and all surrounding areas. No towing, no hassle—fast, on-site repairs for P207F and P20EE.
Call 07503 134 362 or email info@adbluespecialist.co.uk
Open Mon–Sun, 9am–8pm | Covering Stoke-on-Trent, Staffordshire & Midlands
Frequently Asked Questions
P207F indicates AdBlue quality or dosing problems, while P20EE means the SCR catalyst isn’t reducing NOx efficiently. P207F is usually the root cause.
Yes. Our mobile team can diagnose and fix both codes on-site, usually within an hour, using advanced diagnostics and SCR recalibration.
No. A reset without fixing the underlying issue will only clear the code temporarily. The fault will return until the root cause is resolved.
Most repairs start from £60–£180 depending on diagnostics and parts. We provide clear quotes before any work begins.
