2019 Lexus NX300h Engine Is Stalling

Troubleshooting Causes of Engine Stalling in Your 2019 Lexus NX300h and How to Resolve Them

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Fuel System
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15% chance it's the
Air Intake System
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55% chance it's
Something else
The most common reasons a 2019 Lexus NX300h engine is stalling are the fuel system, the air intake system, or the ignition system.
  • Fuel System: A clogged fuel filter or failing fuel pump can restrict fuel flow, resulting in poor engine performance and starting issues.
  • Air Intake System: A dirty or damaged air filter or a malfunctioning mass airflow sensor can restrict airflow, leading to reduced engine performance and efficiency.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2019 Lexus NX300h engine is stalling?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

If the MAF sensor sends an erroneous signal, a few things happen. The engine's computer will trigger the check engine light, and the on-board diagnostic (OBD) trouble codes will reflect the airflow discrepancy noted by the MAF sensor. Depending on the reported volume of air, the engine may try to compensate for these conditions, causing the engine to burn excessive amounts of fuel and emit black smoke from the exhaust. In this case, the OBD trouble codes would also reference faults recognized by the exhaust oxygen sensors. The engine may also have issues with idling roughly, failing to start, stalling, hesitation, power loss, misfires, and fuel consumption.

»MORE: Signs of a failing mass airflow sensor

A faulty oxygen sensor is one of the most common causes of a check engine light. Symptoms may include a decrease in fuel mileage, hesitation or misfiring from the engine, rough idling or even stalling. A faulty sensor may cause the vehicle to fail an emissions test.

Any time there is an emissions fault the check engine light will be displayed. The purpose of the check engine light is to inform the driver that an emission related fault has been found, and that there are on-board diagnostic (OBD) trouble codes stored in the powertrain or engine control module. Additionally, since the emissions systems are so intertwined into engine control and transmission control systems, symptoms may include nearly any sort of drivability concerns. This may include harsh shifting, failure to shift, hesitation on acceleration, jerking, engine failure to start or run, loss of power, or any number of other drivability issues.

When the Check Engine Light comes on, you may experience engine performance issues such as poor acceleration, rough idling, or an engine that won't start. In some cases, no abnormal symptoms will be experienced. Other systems like the transmission or ABS can cause the Check Engine Light to illuminate and lights for those systems can come on at the same time. Similar lights may say "Check Engine Soon", "Malfunction Indicator Light" or just "Check". In rare case the engine can overheat.

What are the initial diagnostic steps to take when a 2019 Lexus NX300h engine is stalling?

When your 2019 Lexus NX300h engine begins to stall, it's essential to adopt a systematic diagnostic approach to identify the root cause effectively. Start by checking for error codes using an OBD-II scanner, as these codes can pinpoint specific issues within the vehicle's systems. Next, inspect the fuel system, including the fuel pump, filter, and injectors, to ensure that fuel is being delivered adequately to the engine. Following this, examine the ignition system components such as spark plugs and ignition coils to confirm they are functioning correctly and providing the necessary spark. Additionally, evaluate the air intake system for any obstructions or leaks that could disrupt airflow, which is crucial for engine performance. Don't overlook the importance of inspecting various sensors, including the mass airflow and throttle position sensors, as they play a vital role in the engine's operation. Lastly, check the battery and charging system to ensure they are supplying sufficient power to the vehicle's electrical components. By methodically following these steps, you can effectively troubleshoot the stalling issue and work towards a resolution.

What are the common problems that could cause the engine to stall in a 2019 Lexus NX300h?

When diagnosing engine stalling issues in a 2019 Lexus NX300h, it's crucial to consider several common problems that could be at play. First, fuel system problems, such as a clogged fuel filter or a malfunctioning fuel pump, can significantly impact engine performance. If the engine isn't receiving adequate fuel, it may stall unexpectedly. Additionally, electrical system malfunctions, including issues with the battery, alternator, or ignition system, can disrupt the power supply necessary for the engine to run smoothly. Another critical area to inspect is the sensors; failures in components like the mass airflow sensor or crankshaft position sensor can lead to incorrect readings, causing the engine to stall. Furthermore, blockages or leaks in the air intake or exhaust systems can hinder airflow, affecting engine efficiency. Lastly, problems with the Engine Control Module (ECM), which oversees various engine functions, can also result in stalling. By understanding these potential issues, DIY enthusiasts can take proactive steps to troubleshoot and resolve engine stalling in their Lexus NX300h, ensuring optimal vehicle performance. Regular maintenance and timely repairs are essential to prevent these problems from escalating.

How urgent is it to address the engine stalling issue in a 2019 Lexus NX300h?

When it comes to a 2019 Lexus NX300h experiencing engine stalling, the urgency of addressing this issue cannot be overstated. Engine stalling can occur unexpectedly, posing a significant safety risk as it may lead to a loss of control while driving. For DIY enthusiasts, it’s crucial to recognize that neglecting this symptom can lead to more severe engine damage or complications that could result in costly repairs down the line. Regular maintenance is key to ensuring the vehicle operates smoothly, and timely repairs can prevent minor issues from escalating into major problems. Therefore, if you notice any signs of stalling, it is advisable to diagnose and address the issue as soon as possible, either by consulting a professional or utilizing DIY methods, to safeguard both your safety and the longevity of your vehicle.

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2019 Lexus NX300h Engine Stalling: Causes & Repair Costs