Infiniti Q70 Diesel Particulate Filter DPF (2013-2018)

The Diesel Particulate Filter (DPF) on the Infiniti Q70, especially in diesel engines like the 2.2d 170 hp and 3.0d models, is a crucial pollution-control device integrated into the exhaust system. Positioned after the catalytic converter and before the exhaust silencer, it is designed to capture up to 99% of fine soot particles expelled during diesel combustion, significantly reducing harmful emissions and carcinogenic risks. Constructed from a ceramic honeycomb structure with microscopic channels, it forces exhaust gases through porous walls trapping particulate matter to ensure cleaner air emission.

The DPF operates through a filtration and regeneration process to maintain engine performance and reduce emissions:

• Filtration : Exhaust gases pass through the microchannels trapping soot on the walls, which gradually forms a layer improving filtration but increasing backpressure if clogged.
• Passive Regeneration : At high exhaust temperatures (above 500-600°C), accumulated soot burns off naturally converting to CO2, water, and ash. Additives may lower the combustion temperature to assist regeneration even under low loads.
• Active Regeneration : When sensors detect clogging through pressure differences, the engine control unit initiates post-injection fuel, EGR valve adjustment, and turbo management to raise exhaust temperature for 5 to 15 minutes to burn soot.

For specific models like the Infiniti QX70 3.0d AWD, driving at speeds of 60-80 km/h for 25-30 minutes can help optimize regeneration.

Common issues that may arise with the DPF on Infiniti Q70 diesel cars include :

• Clogging of the DPF : Frequent short or urban trips prevent proper regeneration causing soot buildup, leading to increased exhaust backpressure and reduced engine power.
• Warning Light Activation : The DPF warning light indicates malfunctions or heavy clogging requiring immediate diagnostic to avoid further engine and emission system damage.
• Increased Emissions : Excess black smoke and failure to trap fine nanoparticles pose health and environmental risks.

Such problems typically affect models like the Q70 2.2d and 3.0 engines, with specific part references such as 1191235 for the 3.0 variant being common for replacement.

Proper DPF maintenance extends filter life and ensures vehicle performance :

• Drive regularly at higher engine speeds (above 3000 rpm) on highways at least once a month to allow passive regeneration.
• Use specialized DPF additives poured into the fuel tank to help dissolve soot residues.
• Perform active regeneration manually via diagnostic tools (OBD) to initiate soot burn-off even on short city trips.
• Consider professional decarbonization treatments for thorough cleaning without removal.

Replacement is costly (between £1000-£2500) and should be done by professionals to avoid fines or vehicle impoundment. Quality OEM products are always recommended for long-term reliability.

Choosing original quality DPF filters designed and manufactured with advanced technology ensures :

• Maximum filtration efficiency with reliable trapping of particulate matter.
• Durability under extreme temperatures using high-grade ceramic and stainless steel materials.
• Compliance with industry certifications and environmental standards.
• Improved vehicle performance, including reduced exhaust backpressure and sustained engine power.
• Peace of mind with warranties typically covering up to 3 years or 100,000 km.

This is particularly true for products certified by automotive authorities and produced using the latest manufacturing processes.

DPF regeneration is essential for maintaining the filter's performance by burning off accumulated soot, and it can be of two types : passive and active.

During regeneration :

• Exhaust gas temperature rises to above 500-600°C to burn particulate matter.
• Engine control may adjust fuel injection and turbo settings to support the process.
• This process ensures reduced emissions, prevents increased backpressure, and maintains optimum engine power and fuel efficiency.

Regular long drives at higher RPM help passive regeneration, while active regeneration may be triggered via diagnostics tools when required.

Signs that indicate possible clogging or DPF issues include :

• Illuminated DPF warning light on the dashboard, signaling fault or excessive soot accumulation.
• Noticeable loss in vehicle power and acceleration.
• Increased black exhaust smoke during acceleration.
• Unusual increase in fuel consumption and engine inefficiency.

Prompt diagnostics using an OBD tool by professional technicians can confirm the cause and initiate proper cleaning or repairs to avoid further damage.

For quality and warranty-backed DPF filters designed for Infiniti Q70 vehicles, it is recommended to choose products :

• Manufactured with stainless steel and high-grade ceramic monoliths for durability and performance.
• Certified by recognized automotive authorities, ensuring compliance with emission standards.
• Offering a minimum 3-year warranty and tested for efficiency equal or superior to original equipment manufacturer (OEM) parts.

Ordering direct from reputable factory manufacturers provides competitive pricing and expert technical support for installation and maintenance. Always avoid second-hand or dubious quality parts to ensure optimal vehicle performance and environmental protection.

For detailed guidance, consult professional service teams who understand Infiniti diesel exhaust systems and provide comprehensive support including installation manuals and technical advice.