DPF Warning Light On or Engine Running Rough? Liqui-Moly DPF Purge 20112 — Clean It Without Removal

A clogged diesel particulate filter is one of the most common causes of DPF warning lights, reduced power, and increased fuel consumption in diesel vehicles. In most DPF-equipped diesel engines, soot and particulate buildup accumulates inside the filter core over time — when passive or active regeneration can no longer clear the blockage, the DPF becomes restricted and engine performance degrades. When it fails to clear, you get warning lights, limp mode, rough running, and eventually a costly off-vehicle DPF replacement or professional cleaning. ⚡ One of the most common maintenance failures in diesel vehicles after 100,000+ km. Part 20112 is the Liqui-Moly Pro-Line DPF Purge — a professional-grade on-vehicle cleaning fluid that dissolves soot and contaminants inside the DPF core without removal, restoring exhaust flow and engine performance.

❓ Is This the Right Product?

This is the correct solution if ALL of the following are true:

• ✔ Vehicle is a diesel with a factory-fitted diesel particulate filter (DPF)
• ✔ DPF warning light is on, or engine is in limp mode due to DPF restriction
• ✔ Active regeneration has failed to clear the blockage
• ✔ ONLY problem is DPF soot blockage — no physical damage, cracks, or melted substrate

Not sure? Send us your vehicle details — we’ll confirm before you order.

🔧 Common Symptoms

• DPF warning light illuminated on the dashboard
• Engine entering limp mode or reduced power mode
• Increased fuel consumption with no other mechanical cause
• Rough idle or sluggish throttle response on a diesel engine

✔ If these symptoms match, a clogged DPF is the most likely cause.

✔ In most cases, the Pro-Line DPF Purge + Cleaner sequence restores normal exhaust flow and clears warning lights without removal.

📦 Product Details

• Part Number: 20112
• Type: Professional on-vehicle DPF purge fluid — dissolves soot and particulate buildup inside the DPF core
• Use With: Pro-Line DPF Cleaner (20110) — required for the full cleaning sequence
• Brand: Liqui-Moly Pro-Line
• Application: All DPF-equipped diesel vehicles — cars, vans, light commercial

⚙️ How to Use

Skill Level: Moderate — 30–60 minutes with the Pro-Line system. Do not remove the DPF. Using the DPF Pressurized Tank Spray Gun (7946) and DPF-Probe (7945), inject the purge fluid directly into the DPF inlet to dissolve soot and contaminants inside the core. Follow with the Pro-Line DPF Cleaner (20110) flush sequence. After treatment, operate the vehicle at highway speed to purge residuals and trigger active regeneration — confirm DPF warning light clears before returning to normal use. Always wear appropriate PPE when handling diesel maintenance fluids.

💡 Pro Tip