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Together we measure the oil and air pressure in the tires of the Mazda CX-5 crossover


The problem of safe vehicle operation never ceases to worry well-known manufacturers, including the Mazda concern. Many systems that were recently presented as options installed at an additional cost are included as standard on Mazda 3, 6, CX 5 and CX 6 models. These include a tire pressure sensor that has proven itself well in the Russian climate.

Mazda CX9

Why check tire pressure?

The catalyst for many accidents is worn-out car tires, and the most serious tread damage occurs on overinflated or low tires.
In the first case, the center of the treadmill burns out - because of this defect, the braking distance increases and the number of accidents during emergency braking increases. In the second case, the edge of the tread wears off - this defect leads to loss of traction when maneuvering. However, incorrect tire pressure can lead to unpleasant consequences not only in the long term. A car driver who ignores the wheel control system signals faces the following problems:

  • loss of dynamics - accelerating to 100 km/h in 7-10 seconds will no longer be possible;
  • decreased controllability - the car skids when turning even on a dry road;
  • increased fuel consumption - instead of the expected 4.6-9.8 per 100 km, the Mazda CX5 will “eat” up to 8-12 liters.

If the tire pressure monitoring sensor is on on the dashboard, do not ignore it, but try to deal with the problem that has arisen.

What to do

Usually, washing the injectors without removing them helps, but there are more complex situations. Then you have to resort to radical measures:

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  • washing of injectors with removal;
  • ultrasonic cleaning of injectors;
  • replacing injectors;
  • cleaning the intake manifold;
  • cleaning the throttle valve.

To prevent malfunction of Mazda CX 5 error p0171, follow these recommendations:

  • refuel your car with recommended fuel at proven gas stations;
  • Regularly, preferably every maintenance, wash the injectors.

If a malfunction and error have already appeared, it is better to immediately wash the injectors with complete disassembly. Washing the injectors without removing them may not give results or may help for a short time.

After flushing and cleaning the injection system, it is recommended to replace the spark plugs. Remains of carbon on the spark plugs and misfires can lead to the SCBS error on the Mazda CX 5 - city braking assistance system. When a misfire occurs, the engine control unit perceives the jerks as braking and lights up the warning light.

How does the Mazda CX5 tire pressure monitoring system work?

The wheel control system can be direct or indirect. The first technology relies on controllers built into the tire. The second system operates with data on the size of the wheel and the associated angular velocity. Mazda's designers opted for an indirect TPMS system.

The main components of the TPMS system are software and four sensors that monitor the angular speed of the wheel. A flat or overinflated tire changes its outer diameter, causing the angular speed to decrease or increase. The control sensor checks this indicator while driving, and the software compares the received data with the basic values. If the basic values ​​deviate, the “Tire pressure error” signal lights up on the dashboard.

For the TPMS system to work, you need to initialize the software and sensors. Without prior activation and calibration, the number of false alarms increases (the signal will remain on even if the tire is correctly inflated).

Check the fuel filler cap

Many drivers, in most cases, when the “check engine” indication appears, will think about serious problems in the car’s engine, but will not even think to check the tightness of the fuel system, which may be compromised due to a defect or an insufficiently tightened fuel tank cap. This is a very common reason for the appearance of the “Check” engine icon.

Reason for the error:

Leakage of the fuel system due to the passage of air through the fuel tank filler cap will increase the vehicle's fuel consumption, to which the vehicle's diagnostic system will generate an engine error by turning on the "Check engine" indication on the vehicle's instrument panel.

What to do:

If, when the “Check” indication appears, your car has not lost power, and there are no audible signs of engine damage (engine knocking, humming, creaking, etc.), then first check the gas tank for leaks.
Your gas cap may be cracked or not tightened enough. If the cap was not tightened enough, then after tightening it all the way, continue driving the car for a while to see if the engine error disappears. To prevent a check engine light from appearing for this reason, check your fuel filler cap regularly. Remember that the cover must be replaced with a new one periodically!

Popular tire models

How to initialize a TPMS system - step-by-step guide

  1. Inflate all four tires of your Mazda CX5 to the recommended internal pressure. For R17 format tires the recommended value is 2.3 bar, for R19 - 2.5 bar.
  2. Insert the key into the ignition. Turn it to the ON position and return it to LOCK. This way you activate the on-board network to which the air control system is connected.
  3. Wait at least 15 minutes. During this time, the on-board computer will catch the sensor signal, read its ID and register the bus controller. If you want to play it safe, wait 20 minutes.
  4. Start the car, start driving and pick up speed up to 25 km/h. Maintain this speed for 10 minutes while driving on a level road.
  5. Check the TPMS system indicator - it should show the correct pressure. If an error signal is on on the panel, press the TPMS SET button, which will reset the controller binding. After the reset, repeat the binding according to the described scheme.

Replace the mass air flow sensor

The mass air flow sensor regulates how much air needs to be added to the gasoline mixture for optimal ignition of the fuel. The sensor constantly reports data to the car's computer about the amount of oxygen supplied. A faulty mass air flow sensor increases fuel consumption, increases CO2 levels in the exhaust gas, and reduces engine power and smoothness. Also, if the sensor is faulty, poor acceleration dynamics are observed. In cold weather, a car with a faulty sensor has difficulty starting.

What are the reasons for the failure of the mass air flow sensor:

Most sensor failures occur due to improper installation of the air filter during its scheduled replacement. Also, if you do not regularly change the air filter, as required by the vehicle maintenance regulations recommended by the manufacturer, the mass air flow sensor may fail.

What to do:

Theoretically, you can drive for a long time with a broken mass air flow sensor (several weeks or months).
But you will notice that the longer you drive, the more your fuel consumption increases. Replacing the sensor in a car service is not that expensive, since the work itself does not take much time and is quite simple. The main costs are related to the cost of the sensor, which for some car models can be 11,000-14,000 rubles if it is an original sensor or up to 6,000 rubles if it is an analogue substitute. Replacing the sensor yourself is very simple. But due to the low cost of replacing the sensor, you can entrust this work to a mechanic at a car service center. Remember that you need to regularly change the air filter, observing the vehicle maintenance regulations!

When does the control system fail?

The indirect TPMS system is not a 100% reliable method of pressure control. It happens that it gives an error in which the signal is on, and the pressure in the wheel is normal. Most often, such a failure occurs when tires of different models are installed on car rims. Another reason may be driving on a bumpy road, during which the wheel dimensions change for natural reasons. The error can also be seen when taking a turn in a long arc.

The sensor does not operate at speeds below 25 km/h, or when tires with rigid sides (Run-Flat models) are installed on the vehicle. Another reason for the lack of a signal may be the replacement of the disk, during which they forgot to install the angular velocity controller.

Replace the oxygen sensor (lambda probe)

The oxygen sensor in your car is part of the exhaust system that monitors how much oxygen is not burned in the engine's combustion chamber. This sensor helps control the vehicle's fuel consumption. A malfunctioning oxygen sensor (lambda probe) means that the car computer is receiving incorrect data, which can significantly increase fuel consumption and reduce engine power. Most cars have 2 to 4 oxygen sensors. If you have a home car error scanner, then by connecting it to the car, you can easily find out which sensor needs to be replaced.

For what reason does the oxygen sensor in a car become unusable?

Over time, the sensor becomes covered with a layer of used engine oil (oil soot), which reduces the accuracy of reading sensor readings for regulating the gasoline mixture and distributing the optimum. A malfunction of the oxygen sensor in a car leads not only to, but also to an increased content of harmful CO2 substances in the exhaust.

What to do:

If you do not replace a faulty car oxygen sensor, this can lead to your car's catalyst failing (it may burst), which will result in expensive repairs.
The cost of new catalysts is very high due to the precious alloys they contain. On some cars, there are several catalysts, the cost of which can reach up to 90,000 rubles. So don't delay replacing the sensor. Although replacing the sensor and its cost is not very small, it is not commensurate with the cost of the exhaust gas catalyst system. You can also save on replacement costs by doing it yourself. Many car manuals have detailed instructions on how to replace the oxygen sensor yourself. If you know where the oxygen sensor is located, then it will not be difficult for you to disconnect the faulty lambda probe and replace it with a new one. Remember that you cannot delay replacing this important element!

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