Pelican Technical Article Mercedes Benz Oxygen Sensor Replacement

10 Май 2015 | Author: | No comments yet »
Mercedes-Benz E 320 CDI W210

The oxygen sensors (also O2 sensors) are one of the most important of the modern fuel injection A finely tuned fuel system with an oxygen can maintain an air/fuel ratio a close tolerance of .02 percent. the engine at the stoichiometric ratio air/fuel ratio) helps the generate the most power the least amount of emissions.

The sensors are located in the exhaust of the engine, and they sense the content of the exhaust gases. are two on this Mercedes Benz engine: one on each side of the converter. The sensor located in front of the catalytic converter the mixture of the exhaust gas exiting the The sensor located after the converter is used to measure the of the converter by comparing the O2 levels and after. The amount of oxygen in the varies according to the air/fuel of the fuel injection system. The sensor produces a small signal that is interpreted by the control unit (ECU) of the injection system. The ECU makes adjustments in fuel delivery to the signal generated by the oxygen in order to maintain the optimum ratio.

There are a few signs that oxygen sensor may be failing. In it is difficult to diagnose problems the sensor, unless all of the other in the fuel injection system been checked and determined to be correctly. Some of the symptoms of a oxygen sensor system

Irregular idle during

Irregular idle with engine

Engine will not and backfires

Poor engine

Fuel consumption is high

performance is weak

CO concentration at is too high or too low

Check Engine is illuminated

Mercedes-Benz E 320 CDI W210

In general, if the oxygen is not working, the car will be running poorly, and will also be a lot of harmful emissions. The cars will usually give a signal that lights up the Engine Lamp if the signal by the computer is out of its normal range. the computer may output an error stating that the oxygen is reading out of range, when in the values registered by the O2 sensor are because there is something wrong with the fuel system. Prior to replacing the sensors, make sure are no other codes being that may affect the O2 sensor

If you disconnect the oxygen sensor and it to the chassis, the ECU will think the car is running lean (not fuel), and will try to richen the At the other extreme, if you disconnect the sensor, and replace it with a AA battery that supplies 1.5 the ECU will think that the car is really rich and attempt to the mixture to be leaner.

Needless to troubleshooting the complete fuel system is beyond this scope. If you think that the sensors may be causing some of fuel injection problems, should be replaced. In general, I that you do this as needed. You have to jack up the car and secure it on jackstands to gain access to the

Using a 22mm wrench, remove the rear sensor the exhaust pipe. On the front sensor, you’ll need to get a creative. The front sensor is in a really tight space and at a odd To loosen it, you’ll need to use a type of crow’s-foot wrench a … cut in the side to remove it. The plug for both O2 sensors from the chassis plug. New O2 should have the same plug — ready to to your car. When you the O2 sensor, you will probably that it is coated with soot. This is normal for an worn out O2 sensor and usually a rich running condition.

your new sensor snug-tight, or if you the proper …-tool and a handy then tighten it to 40 ft-lbs (55 It’s also a smart to add some anti-seize compound to the of the plug before you install it, but sure the anti-seize doesn’t get any of the slits on the head of the sensor. the sensor first though, as new usually come with a dab of already on the threads.

There are two different types of you can purchase: generic ones allow you to snip the connector off of the old and put it on the new one, and original OEM sensors the correct connector. On older I used to use the generic sensors, but had problems with using on these newer cars. further, I discovered that the and connectors are very important on O2 sensors.

Soldering wires together can the reference air signal and lead to with the sensor. I’ve had problems with the Bosch Posi-Lock connectors that are to work with these sensors. Because the relationship the connector and the O2 sensor is so vital to the reference signal, I recommend you only use the correct OEM sensors the proper plug.

Mercedes-Benz E 320 CDI W210
Mercedes-Benz E 320 CDI W210
Mercedes-Benz E 320 CDI W210


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