Sensors


Is the red Engine Management warning Light, EML on?

This could mean a faulty lambda or oxygen sensors. Book now if your vehicle has a running problem.

Our technicians have the knowledge and capability to diagnose and test many different sensors. We are based in Gillingham in the centre of Medway

Oxygen Sensor:

The exhaust gas oxygen sensor is also known as a lambda sensor. It sends an input to the ECU to help balance the fuel/air mixture delivered to the combustion chamber. The correct air/fuel ratio allows the catalyst to break down emissions effectively. The sensor outputs a voltage signal representing the amount of unburnt oxygen in the exhaust gas.

A perfectly balanced fuel/air mixture is 14.7 parts of air to 1 part of fuel. The sensor’s output voltage fluctuates back and forth from rich to lean. Some lambda sensors have a heating element to reduce warm up time. A heated sensor can reach 500 degrees in 8 seconds. This quick warm up reduces emissions improving fuel economy sooner.

Some sensors can be bench tested by applying heat and measuring current output. This method calls for removing the sensor which takes time and hence money. Rather than removing the sensor the more efficient way of testing is to use a scanner. Autoexpert’s technicians possess diagnostic scanners that will read live data hence speeding up the diagnosis and therefore keeping repair cost down.

Cam and Crank Sensors:

These two sensors are generally engine position sensors. A camshaft sensor checks the position of the camshaft and similarly the crankshaft monitors the position of the crankshaft. Both of these sensors send information to the ECU. As a result of this information the ECU regulates when the coil should send power to the spark plug to ignite the fuel.

Book your vehicle in to our workshop in Gillingham in the centre of Medway and our technicians will diagnose and replace a faulty cam or crank sensor.

MAP or MAF Sensors:

The Mass Air Flow sensor measures the volume of air passing through the air intake duct. This information is sent to the ECU which enables the ECU to adjust the amount of fuel delivered through the fuel injectors.

Similarly some vehicles use a Manifold Absolute Pressure or MAP sensor instead of a MAF sensor. The MAP sensor measures manifold pressure and sends this information to the ECU. The ECU then calculates air mass using the engine speed and temperature information. Likewise with the MAF sensor this calculation is used to control the amount of fuel to inject.

Throttle Position and Temperature Sensors:

The ECU also receives signals from both the Throttle Position Sensor and the Coolant Temperature Sensor. This information helps to provide the perfect fuel/air mix for efficient combustion.

In Summary:

You can now begin to see why it is not just a case of simply reading fault codes and replacing a sensor. All these sensors are linked through the ECU and one sensor can effect the running of another.

Autoexperts technicians will diagnose and replace all types of sensors including Camshaft, Crankshaft, MAP, MAF, Knock and Temperature Thermistors.

The red or orange EML is there to warn you that the engine is not running efficiently. When this light is on the your vehicle will be running inefficiently. as a result it will be using more fuel and hence cost you more money. If ignored it could also cause further unnecessary damage to parts like your vehicles catalytic convertor. If you have a running problem call us and book your vehicle in for diagnosis and repair.  Autoexperts Medway’s technicians are capable of carrying out the necessary live data reading of an ECU to establish exactly what part is required.

Why Choose Autoexperts Medway?

Autoexperts Medway in Gillingham have established a superb reputation for high quality vehicle repair services. Refer to our testimonials from our customers from Chatham, Gillingham and Rochester on our testimonial page.

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