Modern diesel engines rely on a well-functioning DEF system to meet emissions regulations and maintain optimal engine performance. At Amin Auto, we provide expert DEF system repair in London, Ontario to restore functionality, improve efficiency, and prevent costly breakdowns. Whether you’re dealing with low fluid warnings, failed sensors, or power loss caused by DEF-related issues, our experienced diesel technicians are equipped to diagnose and repair the system quickly and effectively.
The DEF system plays a crucial role in reducing nitrogen oxide (NOx) emissions through selective catalytic reduction (SCR). However, if components like the DEF injector, pump, or sensor malfunction, it can lead to poor engine performance or force the vehicle into limp mode. That’s why timely DEF system repair is essential to protect your diesel vehicle and ensure compliance.
What Is the DEF System and Why It Matters
The Diesel Exhaust Fluid system is part of your vehicle’s emission control strategy. It injects a urea-based solution (DEF) into the exhaust stream, which reacts with NOx gases in the SCR catalyst to convert them into harmless nitrogen and water vapor.
A faulty DEF system can lead to:
- Decreased engine power
- Active fault codes and check engine lights
- Increased emissions
- Failed emissions inspections
- Vehicle speed restrictions or limp mode
If you’re visiting us for diesel engine diagnostics, we’ll scan for any DEF-related fault codes and assess the condition of the system as part of your full diesel health check.
Our DEF System Repair Services
At Amin Auto, we offer complete DEF system repair solutions to resolve all types of faults in diesel emissions systems.
1. DEF System Diagnostics
We begin with a scan of your vehicle’s onboard diagnostic system to identify any issues related to:
- DEF level sensors
- DEF quality sensors
- SCR efficiency faults
- Faulty DEF injectors or pumps
We also visually inspect hoses, tanks, and heaters for leaks or freeze damage.
2. DEF Injector and Pump Repair
The DEF injector can clog with crystallized fluid, leading to improper dosing. Our service includes:
- Cleaning or replacing clogged DEF injectors
- Testing DEF pump operation and flow
- Inspecting the lines for blockages or damage
3. Sensor and Heater Replacement
DEF systems include multiple temperature and quality sensors, which often fail over time. We provide:
- Replacement of faulty DEF sensors
- Repair of malfunctioning tank heaters (common in winter)
- Reprogramming of system modules if necessary
4. Tank and Line Repairs
If your DEF tank or supply lines are cracked or frozen, we offer:
- DEF tank replacement
- DEF line repairs
- DEF fluid flushing and refilling with certified solution
Once repairs are complete, we reset fault codes and test the SCR system’s efficiency to ensure compliance.
Common Symptoms of DEF System Failure
Your vehicle may require DEF system repair if you notice:
- “DEF Low” warning light that remains on despite refill
- Engine derate or power loss
- Frequent or failed regeneration cycles
- Excessive DEF consumption
- Unusual exhaust odor or emissions test failure
If left unaddressed, DEF system issues can cause further damage to your fuel and exhaust systems. In such cases, our high-pressure fuel pump repair and turbocharger repair and replacement services are also available to ensure complete restoration.
Why Choose Amin Auto for DEF System Repair?
- Diesel Emission Experts – Our technicians are trained in diagnosing and repairing complex DEF and SCR systems.
- Advanced Diagnostic Tools – We use dealer-grade scanners to accurately locate and fix DEF faults.
- OEM-Grade Components – Only high-quality parts for long-term durability.
- Honest Evaluation – We only recommend replacement when cleaning or repair is not viable.
- All-In-One Diesel Service – From fuel injector cleaning to glow plug replacement, everything is handled in one shop.
We help keep your diesel vehicle running clean, efficient, and compliant with environmental standards.
Extend the Life of Your Diesel Engine with Proper DEF System Maintenance
Staying ahead of DEF system issues can help you:
- Avoid unexpected limp mode or speed restrictions
- Maintain fuel efficiency and smooth performance
- Pass emissions tests and avoid costly fines
- Reduce downtime from repeat failures
Combining DEF system maintenance with routine general mechanic and full-service auto repair ensures your entire powertrain remains in top condition. And if your vehicle needs a cosmetic refresh, consider our painting booth and refinishing to complete the restoration.
Book Your DEF System Repair Appointment Today
If your diesel vehicle is experiencing DEF system issues or is stuck in limp mode, schedule your DEF system repair with Amin Auto in London, Ontario today. Our team is ready to restore your emissions system, clear faults, and get you back on the road safely.
- Address: 120 Falcon St Unit 10, London, ON N5W 4Z1
- Phone: +1 226-998-0003
- Email: info@aminauto.ca
- Book Online: Schedule an Appointment
Amin Auto – Trusted DEF System Repair Specialists in London, Ontario.