2015 Volvo V40 Emission Control
Professional Parts SWEDEN 28439635 Diesel Particulate Filter DPF Pressure Sensor
What Is the Emission Control System?
Emission control is one of the most interconnected and consequential systems on any modern vehicle. It is designed to control pollutants such as hydrocarbons, carbon monoxide, and oxides of nitrogen by managing combustion, fuel vapors, crankcase gases, and exhaust treatment. Far from being a single component, it is a network of subsystems — each addressing a different source of harmful gases — that must work in harmony to keep your vehicle running cleanly, efficiently, and legally.
There are three primary sources of vehicle emissions: the engine exhaust, the crankcase, and the fuel tank. Addressing each requires its own set of specialized components. Oxygen sensors monitor the air-fuel ratio so the engine can maintain optimal combustion. The evaporative system captures fuel vapors before they escape into the atmosphere. Crankcase ventilation routes blow-by gases back into the intake to be reburned rather than vented to the air. Air injection systems supply fresh oxygen to the exhaust stream to aid in further combustion. And the vacuum system ties many of these functions together through precise pressure management.
When any part of the emission control system fails, the consequences go beyond a lit check engine light. A malfunctioning emission control system can lead to reduced engine efficiency, higher fuel consumption, and increased tailpipe emissions — potentially causing a failed emissions inspection or triggering drivability issues that worsen over time.
Explore Emission Control Subcategories
Our catalog covers the full breadth of emission control components. Sensors are the backbone of the system, monitoring oxygen levels, air-fuel ratios, temperature, and pressure so the ECU can make real-time adjustments. The Evaporative System — including EVAP canisters, purge valves, and vent solenoids — prevents raw fuel vapors from escaping into the atmosphere and is among the most commonly serviced emission subsystems. The Vacuum System uses engine vacuum to actuate a range of emission and engine management controls, requiring properly functioning hoses, reservoirs, and check valves. The Crankcase Ventilation System — anchored by the PCV valve — recirculates blow-by gases from the engine block back into the intake manifold, improving oil life and significantly reducing unburned hydrocarbon emissions. Finally, the Air Injection System introduces fresh air into the exhaust stream to help oxidize unburned hydrocarbons, particularly during cold starts.
Top Emission Control Brands
Bosch is widely regarded as a pioneer in emission sensor technology — the company invented the automotive oxygen sensor in 1976 and has continued to advance sensor design ever since, supplying OE-quality components to vehicle manufacturers worldwide.
ACDelco offers a comprehensive range of GM OE and Gold-line aftermarket emission components — including vacuum pumps, mass airflow sensors, evaporative emission pipes, and control modules — engineered to maintain factory performance levels for GM and non-GM vehicles alike.
Motorcraft is Ford's factory parts brand, providing emission components built to the same exacting specifications as original Ford equipment, making it a natural first choice for Ford, Lincoln, and Mercury owners seeking precise fitment and reliability.
Standard Motor Products brings decades of expertise in engine management and emission components, offering a broad catalog of sensors, solenoids, EGR valves, and EVAP parts that cover an exceptionally wide range of domestic and import vehicle applications.
Dorman rounds out the lineup with problem-solving replacement parts that often improve on original designs — especially valuable for older vehicles where OE emission components may no longer be readily available from the original manufacturer.