I Fix AdBlue | November 2025
Introduction
The Peugeot Boxer is one of the UK’s most popular light commercial vehicles. Thousands of owners rely on them for daily work—but AdBlue system faults are increasingly common, especially on 2015+ models.
If your Boxer is showing AdBlue warning lights, limp mode, or “AdBlue system fault” messages, you’re not alone. This guide covers the most common Peugeot Boxer AdBlue problems, what causes them, and how much repairs cost.
Most Common Peugeot Boxer AdBlue Problems
1. AdBlue Level Warning Light (Orange)
What it means: Your AdBlue tank is low or empty.
Causes:
- Depleted AdBlue (normal wear)
- Faulty level sensor
- Wiring issue to sensor
- Contaminated AdBlue (rare)
How to fix it:
- Top up AdBlue at any fuel station or garage (usually £15-25 per 10L)
- If warning persists after topping up, sensor replacement needed (£150-250)
- Check wiring connections (free diagnostic)
Cost: £0-250 depending on cause
2. AdBlue System Fault / Red Warning Light
What it means: Critical AdBlue system failure. Vehicle may enter limp mode.
Common causes on Peugeot Boxer:
- Faulty AdBlue heater (most common in winter)
- Blocked or frozen AdBlue line
- Failed SCR catalyst
- Pump failure
- Contaminated AdBlue
How to fix it:
- Diagnostic scan to identify exact fault code
- Replace heater (winter-related faults)
- Flush and replace AdBlue
- Replace pump or SCR catalyst if needed
Cost: £300-800 depending on component
3. Limp Mode / Reduced Power
What it means: Engine is restricted to low RPM and power output.
Why it happens on Boxer:
- AdBlue system detected as faulty
- NOx emissions too high
- Sensor malfunction
- Software issue
How to fix it:
- Diagnostic scan (£50-100)
- Address underlying AdBlue fault
- Reset fault codes
- In some cases, delete may be necessary
Cost: £50-600 depending on root cause
4. AdBlue Pump Failure
What it means: The pump isn’t delivering AdBlue to the SCR system.
Signs:
- “AdBlue system fault” message
- Limp mode
- No AdBlue consumption (tank level stays same)
- Limp mode won’t clear
How to fix it:
- Replace pump assembly (£400-600 including labour)
- Check fuel filter (sometimes contamination causes pump failure)
- Flush system
Cost: £400-600
5. Frozen AdBlue (Winter Problem)
What it means: AdBlue crystallizes in cold weather, blocking the system.
Why Boxers are affected:
- Peugeot’s heater design is less effective than some competitors
- Vehicles parked overnight in sub-zero temperatures
- Inadequate cabin heating
How to fix it:
- Warm vehicle in heated garage for 2-3 hours
- Use AdBlue with anti-freeze additive (winter formula)
- Replace heater if repeated issues (£250-350)
- Consider AdBlue delete if chronic problem
Cost: £0-350 depending on solution
6. SCR Catalyst Fault
What it means: The Selective Catalytic Reduction catalyst is failing or blocked.
Causes:
- Poor quality AdBlue
- Contaminated system
- Normal wear (high-mileage vehicles)
- Thermal shock from repeated cold starts
How to fix it:
- Replace SCR catalyst (£600-1,000 including labour)
- Flush entire AdBlue system
- Use quality AdBlue going forward
Cost: £600-1,000
7. NOx Sensor Malfunction
What it means: The sensor monitoring emissions is faulty, triggering false AdBlue faults.
Signs:
- Fault code P20EE or P204F
- “AdBlue system fault” despite full tank
- Limp mode
- Fault won’t clear after reset
How to fix it:
- Replace NOx sensor (£300-500)
- Clean sensor (sometimes works, £100-150)
- Diagnostic to confirm it’s the sensor
Cost: £100-500
Peugeot Boxer AdBlue Problems by Year & Engine Type
| Year | Engine | Common Issues | Severity |
|---|---|---|---|
| 2015-2017 | 2.0 HDi | Heater failures, frozen AdBlue | Medium |
| 2017-2019 | 2.0 BlueHDi 130 | Pump failures, NOx sensor faults | High |
| 2019-2022 | 2.0 BlueHDi 160 | SCR catalyst issues, limp mode | High |
| 2022+ | 2.0 BlueHDi Euro 6 | Rare faults, mostly sensor issues | Low |
Peugeot Boxer AdBlue Fault Codes Explained
P20EE – NOx Sensor Circuit Range/Performance
What it means: NOx sensor reading is out of range.
Causes:
- Faulty NOx sensor
- Wiring issue
- ECU problem
- Contaminated sensor
Fix: Replace sensor (£300-500) or clean (£100-150)
P204F – SCR System Efficiency Below Threshold
What it means: AdBlue system isn’t reducing emissions effectively.
Causes:
- Low quality AdBlue
- Blocked SCR catalyst
- Faulty heater
- Pump not working
Fix: Flush system, replace components as needed (£300-800)
P2002 – NOx Trap Efficiency Below Threshold
What it means: Emissions control system failing.
Causes:
- Blocked DPF or SCR
- Engine oil contamination
- Faulty sensor
Fix: Clean or replace DPF/SCR (£400-1,200)
P0101 – Mass Air Flow Sensor
What it means: Air intake sensor malfunction (often linked to AdBlue issues).
Causes:
- Carbon build-up
- Sensor failure
- Intake blockage
Fix: Clean or replace sensor (£150-300)
Peugeot Boxer AdBlue Repair Cost Breakdown
| Problem | Cost Range | Time | Notes |
|---|---|---|---|
| Top-up AdBlue | £15-25 | 10 mins | DIY or at fuel station |
| Level sensor replacement | £150-250 | 1-2 hours | Common on older Boxers |
| Heater replacement | £250-350 | 2-3 hours | Winter-related |
| Pump replacement | £400-600 | 3-4 hours | Labour-intensive |
| NOx sensor replacement | £300-500 | 1-2 hours | Often fixes fault codes |
| SCR catalyst replacement | £600-1,000 | 4-6 hours | Most expensive repair |
| Full system flush | £200-400 | 2-3 hours | Clears contamination |
| Diagnostic scan | £50-100 | 30 mins | Identifies exact fault |
5-Year Cost Comparison: Repair vs Delete
| Scenario | Year 1 | Years 2-5 | Total 5-Year Cost |
|---|---|---|---|
| Keep & Repair | £200-400 | £800-2,000 | £1,000-2,400 |
| Keep & Replace SCR | £600-800 | £400-1,000 | £1,000-1,800 |
| Delete | £300-350 | £0 | £300-350 |
The verdict: For Boxer owners facing repeated AdBlue faults, a delete is the most cost-effective long-term solution.
How to Prevent Peugeot Boxer AdBlue Problems
1. Use Quality AdBlue
- Buy from reputable suppliers (Halfords, fuel stations, specialist shops)
- Avoid cheap, unbranded AdBlue
- Use winter formula in cold months (contains anti-freeze)
Cost: £15-25 per 10L (quality brands)
2. Keep Tank Topped Up
- Don’t let level drop below 25%
- Refill at regular intervals
- Check level weekly on long trips
3. Park in Heated Garage (Winter)
- Prevents freezing
- Extends system life
- Reduces heater strain
4. Regular Servicing
- Follow Peugeot service schedule
- Check AdBlue system annually
- Replace fuel filter on time
5. Avoid Contamination
- Don’t mix AdBlue with diesel or water
- Use clean containers
- Store AdBlue in cool, dry place
When Should You Consider AdBlue Delete?
Ask yourself these questions:
- Have you had 2+ AdBlue faults in the last 12 months?
- Are repair costs adding up (£500+)?
- Do you plan to keep the Boxer 2+ years?
- Are you comfortable with MOT/legal considerations?
- Do you want to eliminate future AdBlue headaches?
If YES to most of these, an AdBlue delete could save hundreds.
Frequently Asked Questions
What is AdBlue and why does Peugeot Boxer need it?
AdBlue is a urea-based fluid that reduces NOx emissions on diesel engines. EU regulations require it on all Euro 5+ diesel vehicles (2015+). Peugeot Boxers use AdBlue in their SCR system to meet emissions standards.
How often should I top up AdBlue on a Peugeot Boxer?
Typically every 5,000-10,000 miles depending on driving style and engine type. A full tank (around 20L) lasts 3-6 months for most users.
Can I drive with an AdBlue warning light?
Short-term: yes, but limp mode may activate. Long-term: no. The vehicle will eventually enter limp mode and restrict power. Get it checked within 24-48 hours.
How much does it cost to fix a Peugeot Boxer AdBlue fault?
£50-1,000 depending on the problem. Diagnostic: £50-100. Sensor replacement: £150-500. SCR catalyst: £600-1,000.
Is AdBlue delete legal on a Peugeot Boxer?
It’s not approved by manufacturers or DVSA, so it’s technically an emissions modification. Currently, if emissions are within limits and no fault lights are present, it usually passes MOT. But rules may tighten in future.
Will AdBlue delete affect my Peugeot Boxer’s performance?
Yes, positively. Most owners report +5-10% fuel economy improvement, better throttle response, and smoother running. No performance loss.
Can I reverse an AdBlue delete?
Yes, the original ECU file can be restored. However, most customers keep the delete permanently.
What’s the difference between AdBlue delete and DPF delete?
AdBlue delete removes the SCR system (emissions reduction). DPF delete removes the diesel particulate filter (soot reduction). Many customers do both for maximum benefits.
How long does an AdBlue delete take on a Peugeot Boxer?
Usually 2-4 hours depending on ECU type. With our mobile service, we come to you—no garage trip needed.
Can I combine AdBlue delete with other modifications on my Boxer?
Yes. Many customers combine AdBlue delete with DPF delete, EGR delete, or NOx sensor delete for full emissions optimization.
Why is my Peugeot Boxer AdBlue freezing in winter?
Peugeot’s heater design is less effective in sub-zero temperatures. AdBlue freezes at -11°C, and the heater may not warm it fast enough. Use winter formula AdBlue (contains anti-freeze) or park in a heated garage.
What should I do if my Boxer enters limp mode due to AdBlue fault?
First, top up AdBlue and reset the fault code (using a diagnostic tool). If it returns, get a professional diagnostic scan to identify the root cause (sensor, pump, heater, etc.). Don’t ignore it—limp mode reduces power significantly.
Why Choose Professional AdBlue Repair or Delete?
We’ve fixed over 500 Peugeot Boxer AdBlue faults since 2020. Here’s what we bring:
✓ Expert diagnostics to identify exact problem✓ Professional tuning tools (Autotuner, CMD Flash)✓ Mobile service — we come to you✓ Safe, industry-standard methods✓ Clear explanation of all options (repair, replace, delete)✓ Transparent pricing with no hidden costs✓ Same-day or next-day availability
Ready to Fix Your Peugeot Boxer AdBlue Problem?
Whether you need a repair, sensor replacement, or full delete, we can help. We’ll diagnose the issue, explain your options, and carry out the work safely at your home or business.
Get Your Free Diagnostic Today
Serving Leicester, Leicestershire, and nearby counties
Same-day or next-day bookings most weeks. No garage trip, no wasted time.
📞 Call: 07503 134362
📧 Email: info@ifixadblue.co.uk
⏰ Hours: Monday–Sunday, 09:00–20:00
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