Replacement of the Nissan Qashqai probe lamp

Lambda probe (DC) is one of the main components of the exhaust system of modern cars. The elements appeared in connection with the constant tightening of environmental requirements, their task is to fix the amount of oxygen in the exhaust gases, which allows you to determine the optimal composition of the air-fuel mixture and eliminate the increase in gasoline consumption.

Lambda probes (there are two of them) are used in all Nissan Qashqai models, including the first generations. Unfortunately, over time, the sensor can fail. Its restoration is an ineffective solution; it is much more reliable to carry out a complete replacement.

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The first oxygen sensor is located in the intake manifold.

Major breakdowns

Sensor defects are usually expressed as follows:

• breakage of the heating element;

• burning of the ceramic tip;

• contact oxidation, formation of corrosion, violation of the original electrical conductivity.

The failure of the probe may be due to the expiration of the service life. For Qashqai, this value is about 70 thousand kilometers.

The status is automatically controlled by the vehicle's own system.

The appearance of a malfunction immediately causes the activation of the LED on the instrument panel.

It should be remembered that deviations in operation, indirectly indicating a malfunction of the sensor, may also be associated with other modules of the fuel and exhaust system. It will be possible to determine the exact cause with the help of diagnostics. Failure Definition

The following indicates a sensor failure:

• significant increase in fuel consumption;

• motor instability, constant "floating" speed;

• early failure of the catalyst due to its clogging with combustion products;

• jolts when the car is moving;

• lack of dynamics, slow acceleration;

• periodic stops of the engine idling;

• after a stop in the area where the lambda probe is located, a roar is heard;

• A visual inspection of the sensor immediately after stopping shows that it is red hot.

Causes of breakage

According to the statistics of Nissan Qashqai service centers, the most common causes of parts failure are:

• Poor fuel quality, high content of impurities. The greatest danger to the product is lead and its compounds.

• Body contact with antifreeze or brake fluid causes extensive oxidation, temperature fluctuations, surface and structural damage.

• Attempted self-cleaning using unsuitable compounds.

Cleaning

Many Nissan Qashqai owners prefer to clean the sensor rather than replace it with a new part. In general, this approach is justified if the cause of failure is pollution with combustion products.

If the part looks normal on the outside, there is no visible damage on it, but soot is noticeable, then cleaning should help.

You can clear it like this:

• The main active ingredient is phosphoric acid, which perfectly dissolves carbon deposits and rust. Mechanical cleaning methods are unacceptable, sandpaper or a metal brush can permanently damage the part.

• The cleaning process itself is based on keeping the sensor in phosphoric acid for 15-20 minutes and then drying it. If the procedure did not help, there is only one way out - a replacement.

Replacement

Changing the lambda probe for a Nissan Qashqai is quite simple, since the part is located in the exhaust manifold and this makes it easier to access.

Before replacing, it is necessary to warm up the power plant well, the thermal expansion of the metal makes it easy to disconnect the part from the manifold.

The instruction is as follows:

• Shut off the engine, switch off the ignition.

• Disconnecting cables.

• Remove the failed part with a socket or wrench, depending on the sensor type.

• Installation of a new element. It must be screwed in until it stops, but without excessive pressure, which is fraught with mechanical damage.

• Connecting cables.

Ideally, put the original Nissan sensors. But, in its absence, or an urgent need to save money, you can use analogues from the German company Bosch.

They have proven themselves well with the owners of Kashkaev, they work perfectly and have a service life similar to the original.

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