The Nissan Qashqai has earned its reputation as one of the most popular compact crossovers on the road. Millions of drivers rely on it for daily commutes, weekend getaways, and everything in between. Under that sleek body, though, sits a collection of precisely engineered components that keep the engine running clean and efficient.
One system that deserves your attention is the EGR (Exhaust Gas Recirculation) and turbocharger assembly. These parts work together to reduce harmful emissions, improve fuel economy, and give you that responsive power you feel when you press the accelerator. They are some of the most hardworking components in your Qashqai’s engine bay, and yet most owners have never seen them up close.
Whether you’re troubleshooting a performance issue, ordering replacement parts, or simply curious about what makes your Qashqai tick, understanding this system gives you a real advantage. Let’s break down every component in this assembly so you know exactly what you’re looking at and why each piece matters.
Qashqai Parts Diagram & Details
The diagram (reference J14700K) presents an exploded view of the Nissan Qashqai’s EGR and turbocharger assembly. Each component is shown separated from the others and labeled with its corresponding Nissan part number, starting with the 147xx series. At the top of the diagram, you’ll find the EGR valve and its actuator motor. Moving down through the center, you’ll see the EGR cooler body, various gaskets, and the mounting brackets that hold everything in place. The lower portion features the main EGR cooler tube with its distinctive corrugated flexible section, the turbocharger body, and the inlet and outlet pipes that channel exhaust gases through the system.
What ties all of these parts together is their shared purpose: managing exhaust flow to reduce nitrogen oxide emissions while maintaining engine performance. Every gasket, bracket, and connector plays a specific role in keeping this system sealed, stable, and functioning correctly. Here’s a closer look at each component and what it does for your Qashqai.
1. EGR Valve (14710B)
The EGR valve sits at the top of the assembly and acts as the main gatekeeper for exhaust gas recirculation. Its job is to open and close at precisely timed intervals, allowing a controlled amount of exhaust gas to flow back into the engine’s intake manifold. This recycled exhaust lowers combustion temperatures, which directly cuts down on nitrogen oxide (NOx) emissions.
You’ll notice the valve is a relatively compact unit, but don’t let its size fool you. A malfunctioning EGR valve can cause rough idling, poor acceleration, and even trigger your check engine light. Carbon buildup is the most common culprit behind EGR valve failure in the Qashqai, especially on diesel models that see a lot of short trips around town.
2. EGR Valve Actuator Motor (14710F)
Mounted directly to the EGR valve, the actuator motor is the electronic brain that controls how far the valve opens or closes. It receives signals from your Qashqai’s engine control unit (ECU), which constantly adjusts the EGR flow based on engine load, speed, and temperature. This precise electronic control replaced the older vacuum-operated systems and gives your engine much finer management of exhaust recirculation.
If the actuator motor fails, the EGR valve may get stuck in an open or closed position. A valve stuck open can cause misfires and stalling at idle, while one stuck closed means your emissions system won’t function properly. Replacement of this part usually requires removing the entire valve assembly from the engine.
Because the actuator motor contains delicate internal gears and an electric motor, it’s sensitive to excessive heat and moisture. Keeping an eye on any unusual engine warning lights can help you catch actuator problems early, before they cause bigger headaches.
3. EGR Cooler Body (14717)
Sitting in the middle of the assembly, the EGR cooler body is where exhaust gases are cooled before they re-enter the intake system. It works like a small heat exchanger, using engine coolant to pull heat out of the exhaust gas. Cooler exhaust gas is denser and does a better job of lowering combustion temperatures inside the cylinders.
The cooler body connects to both the EGR valve above it and the EGR tube below. Over time, the internal passages can accumulate soot and carbon deposits, reducing cooling efficiency. A clogged or cracked EGR cooler can lead to increased emissions, overheating, and even coolant leaks into the exhaust system, so it’s a part worth inspecting during routine maintenance.
4. EGR Cooler Tube (14710A)
The EGR cooler tube is the main conduit that routes exhaust gases from the turbocharger area up through the cooler and into the EGR valve. In the diagram, you can see it stretching across the lower-to-middle portion of the assembly. Its length and routing are carefully designed to give exhaust gases enough contact time with the cooling surfaces.
This tube is built from heat-resistant materials capable of handling the extreme temperatures of exhaust gas. Cracks or corrosion along the tube can cause exhaust leaks, which you might notice as a hissing sound under the hood or a faint exhaust smell in the cabin. Replacing the cooler tube typically involves disconnecting it from multiple gasket points, so it’s a job that takes some patience.
5. Flexible EGR Pipe (14719)
One of the most distinctive parts in the diagram is the corrugated, flexible section of the EGR pipe. This bellows-style pipe section allows for thermal expansion and engine movement without cracking or breaking the rigid connections around it. Engines vibrate and shift slightly on their mounts during operation, and this flexible pipe absorbs all of that movement.
Without it, the rigid metal tubes and fittings would be under constant stress, eventually leading to cracks and leaks. The flexible pipe is particularly vulnerable to corrosion from the inside out, since hot, acidic exhaust condensation passes through it constantly. If you ever spot dark stains or soot marks around this section during an inspection, it’s a sign the bellows may have developed a small perforation.
A leaking flexible pipe often shows up as a slight drop in engine performance and a ticking or puffing noise that changes with engine speed. Catching it early saves you from more expensive repairs down the line.
6. Turbocharger Assembly (14120)
The turbocharger sits at the lower right of the diagram and is arguably the most performance-critical component in this entire assembly. It uses exhaust gas energy to spin a turbine, which in turn compresses incoming air and forces it into the engine. More air means more efficient combustion, giving you better power output from a smaller displacement engine.
In the Qashqai, the turbocharger is closely integrated with the EGR system, since both share the same exhaust gas supply. The turbo housing contains the turbine wheel on the exhaust side and the compressor wheel on the intake side, separated by a center section that houses the bearings.
Turbocharger issues often present as a loss of power, excessive smoke from the exhaust, or a whining noise that increases with RPM. Oil supply to the turbo bearings is critical, so regular oil changes with the correct specification directly extend the life of this part.
7. Turbocharger Inlet and Outlet Components (14120B, 14120N)
These components form the entry and exit points of the turbocharger. The inlet directs exhaust gases from the engine’s exhaust manifold into the turbine housing, while the outlet channels the spent gases onward through the exhaust system. Proper sealing at both points is essential for maintaining boost pressure and preventing exhaust leaks.
The outlet component (14120B) at the bottom right of the diagram connects to the downpipe that leads to the catalytic converter. Any leak at this junction will affect turbo efficiency and could trigger emission-related fault codes on your dashboard.
8. Mounting Brackets (14715P, 14715PA, 14717A)
Three distinct mounting brackets appear throughout the diagram, each securing a different section of the EGR and turbo assembly to the engine block or cylinder head. Bracket 14715P supports the upper EGR valve area, 14715PA holds the actuator side in place, and 14717A stabilizes the EGR cooler body.
These brackets may look like simple stamped metal pieces, but they serve a vital purpose. They absorb engine vibration and keep the heavy EGR and turbo components from shifting under load. A broken or missing bracket can cause stress fractures in the connecting pipes, lead to gasket failures, and even allow components to rub against other engine parts.
During any repair involving the EGR or turbo system, always check the condition of these brackets. Corroded or bent brackets should be replaced rather than reused, since they won’t provide the proper support the assembly needs.
9. Gaskets and Seals (14716AA, 14719+A, 14710+A, 14120G, 14120GA, 14120BA)
Scattered throughout the diagram, you’ll count at least six individual gaskets, each positioned at a connection point between two major components. These gaskets create airtight seals that prevent exhaust leaks and maintain proper system pressure. They’re made from heat-resistant materials designed to withstand the extreme temperatures cycling through the EGR and turbo system.
Gasket failure is one of the most common sources of exhaust leaks in the Qashqai. Symptoms include a ticking noise at startup that fades as the engine warms up, the smell of exhaust fumes, or soot deposits around the connection points. The general rule with these gaskets is straightforward: any time you remove a component, always fit a new gasket when you reassemble it. Reusing old gaskets is a gamble that rarely pays off.
10. EGR Temperature Sensor and Cable (14730, 14735)
Running along the far left of the diagram, you’ll see a long cable assembly with a sensor at its tip. This is the EGR temperature sensor, which monitors the temperature of exhaust gases passing through the system. The ECU uses this data to fine-tune EGR valve operation, ensuring optimal exhaust recirculation under all driving conditions.
Part 14735 is the small retaining clip that secures the sensor cable to the engine, keeping it from dangling near hot or moving parts. A damaged sensor will send incorrect readings to the ECU, which can result in the engine running too rich or too lean. You might notice increased fuel consumption or a persistent engine management warning light as the first signs of sensor trouble.
11. EGR Tube Connectors and Fittings (14710AB, 14710R, 14710RA, 14710BB)
Several smaller connectors and fittings link the major EGR components together. Part 14710AB connects the cooler tube to the cooler body, while 14710R serves as the outlet fitting at the base of the assembly. 14710RA provides the connection point between the cooler and the turbocharger area, and 14710BB functions as a securing bolt for one of the tube joints.
These fittings need to be torqued to the correct specification during installation. Over-tightening can crack the fittings or strip the threads, while under-tightening leaves you with an exhaust leak. If you’re working on this system yourself, a calibrated torque wrench is absolutely essential.
12. EGR Pipe and Intake Connections (14710, 14710G, 14710BA)
The final group of components includes the lower EGR pipe sections and their connections to the intake side of the engine. Part 14710 is a main pipe section that channels cooled exhaust gas from the EGR system into the intake manifold, where it mixes with fresh air before entering the combustion chambers. Parts 14710G and 14710BA are smaller fittings and connectors within this routing.
Getting the right air-to-exhaust ratio is crucial for clean, efficient combustion. Any air leak in these connections dilutes the carefully metered EGR flow, reducing its effectiveness. During reassembly, make sure every fitting seats flush and every clamp is snug. A quick visual inspection of this area during your regular oil changes can alert you to developing issues before they become costly problems.
