All You Need to Know About Diesel Emissions & DEF Repairs
All You Need to Know About Diesel Emissions & DEF Repairs
Modern diesel engines are cleaner and more efficient than ever—but they come with complex emissions systems that require maintenance and occasional repairs. If your dashboard is flashing a DEF or DPF warning light, you’re not alone. Many diesel owners in New Jersey, Pennsylvania, and Delaware face emissions-related issues that can affect performance, fuel economy, and compliance.
At Kash Diesel & Auto, we specialize in diagnosing and repairing diesel emissions systems for trucks of all sizes. Here’s what you need to know.
Understanding Diesel Emissions Systems
Diesel emissions systems are designed to reduce harmful pollutants like nitrogen oxides (NOx) and particulate matter. Key components include:
- DEF System (Diesel Exhaust Fluid): Injects urea into the exhaust stream to neutralize NOx emissions.
- DPF (Diesel Particulate Filter): Captures soot and particulate matter before it's released.
- EGR (Exhaust Gas Recirculation): Circulates some exhaust gases back into the engine to reduce combustion temperatures and emissions.
Common Emissions System Issues
1. DEF Warning Light
If the DEF tank is low or the system detects a quality issue, your truck may enter “limp mode.” Don’t ignore it—call a diesel specialist.
2. DPF Clogging or Regeneration Failure
A clogged filter restricts exhaust flow, reducing power and triggering warning lights. Forced regeneration or filter replacement may be required.
3. EGR Valve Malfunction
A stuck or carbon-filled EGR valve can cause rough idling, poor fuel economy, or engine hesitation.
4. Emissions Fluid Crystallization
DEF can crystallize in cold weather or when improperly stored, leading to injector clogs and flow issues.
5. Check Engine Light with Emissions Codes
Modern diesel engines use dozens of sensors. A malfunctioning sensor can shut down performance or affect fuel mapping.
Diesel Emissions Repairs We Offer
- DEF system flush and injector cleaning
- DPF regeneration and replacement
- EGR valve cleaning and repair
- Sensor diagnostics and resets
- Full emissions system rebuilds
What Happens If You Ignore Emissions Issues?
- Power loss and reduced fuel economy
- Risk of vehicle entering limp mode
- Failed DOT or state inspections
- Fines for emissions non-compliance (especially for fleets)
- Long-term engine damage from backpressure and poor combustion
FAQs
How often should I refill DEF?
DEF consumption varies but typically equals 2–5% of fuel usage. Keep the tank at least one-third full to avoid warnings.
Can I bypass or delete emissions components?
No. Emissions deletes are illegal in NJ, PA, and DE and can result in fines. Kash Diesel only performs emissions-compliant repairs.
What’s a forced regeneration?
This process burns off soot from the DPF at high temperatures. It may be triggered automatically or manually via scan tools.
How long does an emissions repair take?
Basic diagnostics and cleaning can be done same-day. Replacements may take 1–3 days depending on parts.
Do you work with fleets?
Yes! We help keep business vehicles emissions-compliant and on the road with minimal downtime.
Trust Kash Diesel & Auto for Emissions System Repairs
Located in Sicklerville, NJ, Kash Diesel & Auto provides emissions system diagnostics and repairs for Cummins, Duramax, Powerstroke, and more. Whether you’re a daily driver or a fleet manager, we ensure your truck runs clean and strong.
Call (267) 978-6620 or visit 883 Jarvis Road, Sicklerville, NJ for DEF, DPF, or EGR service today.
