Pelican Technical Article Mercedes Benz Oxygen Sensor Replacement

10 мая 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 performance

consumption is high

Driving is weak

CO concentration at idle is too or too low

Check Engine Lamp is

Mercedes-Benz E 320 CDI W210

In general, if the oxygen sensor is not the car will be running very and will also be outputting a lot of emissions. The cars computer usually give a warning that lights up the Check Lamp if the signal received by the is out of its normal range. Sometimes the may output an error code that the oxygen sensor is out of range, when in reality the registered by the O2 sensor are accurate there is something else with the fuel injection Prior to replacing the oxygen make sure there are no codes being recorded may affect the O2 sensor readings..

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 slit 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 slit-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 can interrupt the reference air signal and to problems with the sensor. also had problems with the factory Posi-Lock connectors are supposed to work with newer sensors. Because the between the connector and the O2 sensor is so to the proper reference signal, I that you only use the correct OEM with 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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