When the idling of your vehicle seems to be off, you will probably notice a sharp reduction of fuel efficiency, and these are issues likely related to the oxygen sensor, often located between the catalytic converter and the exhaust manifold. You do not want to drive too many miles with a faulty O2 sensor, particularly when considering that replacement is not an expensive repair.
Mass Air Flow Sensor
You can see this sensor when you open the hood of your Honda CRV; it is attached to the air filter casing, and it measures the amount of fresh air flowing through the engine. A complete malfunction of this sensor may result in random stalling of the engine, but it may also be indicative of other issues such as obstructions or even a very dirty air filter.
Manifold Absolute Pressure Sensor
As its name suggests, this sensor measures pressure, which is needed by the ECM to adjust fuel injection patterns according to engine load. This sensor is crucial in terms of engine performance and fuel economy.
Crankshaft and Camshaft Position Sensors
These sensors, which are often built to last, measure mechanical positions. Without these sensors, your CRV will not operate because the ECM would not be able to control the timing of the engine. The engine speed sensor works together with these two devices to control proper fuel injection and performance.
Spark Knock Sensor
Internal combustion engines are powered by means of regulated explosions ignited by the spark plugs. A knock is an unwanted detonation that can damage the engine because the resulting mixture of air and fuel is produced at very high pressures and temperatures. The spark knock sensor resembles a spark plug; it listens for abnormal detonations, thus allowing the ECM to formulate the right fuel and air mixture.
Throttle Position Sensor
This sensor measures the mechanical performance of the throttle valves, which open up based on the position of the accelerator pedal as you press down on it. In essence, the TPS detects the response time of the throttle valve. Abnormal readings or total TPS malfunction will likely activate the “check engine” light, and they may also cause the car to hesitate or suddenly accelerate.
Tire Pressure Monitoring Sensor
The function of this sensor is pretty easy to guess given its name. Basically, the TPMS is the modern equivalent of the manual tire pressure gauges that you can still find at many gas stations and auto parts stores; the difference is that installation in new vehicles has been mandatory since 2008. Readings from these sensors, which are battery-powered and located near the wheel assembly, are transmitted to the ECM and displayed on the dashboard for your convenience. Some drivers feel that these sensors are not as critical as the ones listed above, but they are very important in terms of road safety because they can let you know about punctured tires.