Cleaner diesel 39 data and precise dosing. Multiple sensors such as NOx sensors, temperature sensors, and pressure sensors, feed information to the engine control unit to ensure correct operation. Even minor inaccuracies in these inputs can trigger warning lights, reduced engine performance or vehicle derating. In many cases, the issue is not with the SCR catalyst itself, but with the sensor network or dosing system controlling it. The role of sensors and engine management Both DPF and SCR systems depend on a network of sensors and engine management components working in harmony. Key components include: O Exhaust gas temperature sensors (EGTS) O NOx sensors O Mass air flow (MAF) and manifold absolute pressure (MAP) sensors O Lambda (oxygen) sensors O Fuel system components such as common rail injectors and pumps These are not isolated parts, but they form an integrated system that directly influences emissions performance. DENSO has developed a wide range of engine management and diesel components, including sensors, injectors and fuel system parts designed to match OE specifications and operate as part of a complete system. For workshops, this OE alignment is particularly relevant when replacing components in emission-critical systems, where tolerances and response times are key. Diagnosing the root cause One of the most common pitfalls in dealing with DPF and SCR faults is replacing components without identifying the root cause. For example, a blocked DPF may be the result of poor combustion caused by worn injectors, an SCR fault may originate from incorrect temperature readings or sensor failure, and excessive AdBlue consumption may point to incorrect dosing rather than a catalyst issue. Therefore, a structured diagnostic approach is essential. It is important to retrieve and interpret fault codes and live data, verify sensor readings against expected values, check fuel system performance and injector condition and assess driving patterns and regeneration history. Understanding the interaction between fuel injection, sensor feedback and aftertreatment systems is key to achieving a first-time fix. As diesel technology becomes increasingly complex, workshops are expected to diagnose and repair systems that are highly integrated and electronically controlled. This is where OE-derived expertise becomes critical. Manufacturers like DENSO, who design and supply components such as common rail systems, sensors and engine management technologies, bring a system-level understanding that is directly relevant to the aftermarket. For technicians, using components designed to work within these tightly controlled systems can help ensure consistent performance, compliance with emissions standards and reduced risk of repeat failures. The bottom line DPF and SCR systems cannot be viewed in isolation. Their performance depends heavily on combustion quality, sensor accuracy and engine management. For today’s workshop, success lies in understanding the complete system, not just the symptom. With the right diagnostic approach, and by using quality components that meet OE specifications, technicians can improve repair accuracy, reduce comebacks and keep modern diesel vehicles operating cleanly and efficiently. www.denso-am.eu
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