The "check engine" warning light comes on - what to do
Check engine warning light
Turning on the "check engine" warning light usually does not mean that the car cannot continue to drive. Here's what can be the reason and how to behave.
From the outset, the injection systems are designed to ensure that the engine can be operated even when a fault occurs. injection. However, it was decided that the driver must be notified of the malfunction. Therefore, a "check engine" light appears on the control panel, indicating an engine failure.
In reality, however, it is a lamp that indicates a problem with engine electrics that affects the exhaust emissions and engine performance. Despite the revolution that the acceleration systems have undergone, the control function has not changed.
When will the check engine light come on?
The on-board self-diagnostic system cannot detect mechanical engine damage until it affects the sensor signals of the vehicle engine management system. The system responds to any inconsistencies in the electrical signal, but does not turn on any inconsistencies in the motor failure indicator. If the defect is considered negligible, it remains only in memory and only after a few times does the message "check engine" appear.
On the other hand, in the event of a significant fault, ie, for example, when a fault has a large effect on the composition of the exhaust gases, the engine fault indicator illuminates.
What to do?
Systems whose failure prevents further driving, as a rule, have a warning light of red. The lack of oil pressure or engine overheating actually require an immediate shutdown of the engine. Meanwhile, orange controls are a warning that a problem is occurring, but not necessarily stopping.
This is exactly the case with the "check engine" indicator, which only informs the driver about the problem. If the ignition of the engine fault lamp is not accompanied by a sudden drop in performance, it is usually possible to complete the journey without major problems. If the "check engine" light comes on, you definitely don't need to drive long without checking because there can be bigger problems.
When to turn off the engine?
It has happened that the engine failure lamp is accompanied by a major decline in performance. The transition to the so-called Emergency engine mode is particularly noticeable for turbodiesel with variable turbine geometry when the turbine pressure control wings are blocked and maximum overpressure pressure is exceeded. Then it's worth stopping the car in a safe place, turning off the engine and starting the engine again. If the overrun was temporary, there is a good chance that after the engine has restarted, the engine will run normally.
The most common causes of ignition "Check Engine"
In order for the engine failure indicator to turn on, the ECU of the engine must repeatedly record a serious malfunction or repeated recurrence of a minor problem. The self-diagnostic system responds only to those failures that are able to detect sensors operating on the engine and its accessories.
Catalyst
Catalyst
A second lambda probe controls the operation of the catalyst and detects a poorer catalyst operation.
Lambda probe defect
Lambda probe
An incorrect lambda probe signal is one of the most common mistakes made in gasoline engines.
Bomb failure
Coil
A typical failure of many gasoline engines, the engine starts to malfunction.
Turbine geometry blocking
Excessive charging in turbochargers is often caused by the turbo steering.
Special cases: Auto gas cars
Relatively often, the message "check engine" appears on cars with autogas. This is in most cases the result of deregulation of the installation and incorrect dosing of gases. The problem is mainly related to installations that are neglected by the owner (filters are not changed regularly, etc.).
Diagnosis and switching off of the "check engine" lamp
Just turning off the "check engine" light does not solve the problem. It is necessary to find out the reason for the error. However, if it is already known, the error message can be deleted either by a mechanic or you can do it yourself. Otherwise, we can use the phone app.
All cars manufactured since 2000 have an ODBII Diagnostic System, which establishes universal fault codes. In the case of a propulsion system, these are codes P0001 to P0999. Numbers above P1000 are reserved for certain car manufacturer codes.
In a workshop
The diagnostic tester used in the workshop has many features, and one of the basic ones is to erase errors.
A smartphone
The smartphone can work as a diagnostic tool in cars after 2002. It is necessary to buy OBDII interface (ELM327) and download an app (e.g. Torque Prose).
The "check engine" light is a sign that there has been a malfunction in the engine, but at the same time nothing that would stop the drive immediately. Be sure to check the cause of the error, but you can do it safely even after the trip. Driving with a signal error for a long time can be harmful, for example, to the catalytic converter.
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Hi there, I am Mladen and I am an auto enthusiast. I started this blog years ago to help like minded people share information about latest cars, car servicing ideas, used car info, exotic cars, and auto technology. You will find helpful articles and videos on a wide variety of cars - Audi, Mercedes, Toyota, Porsche, Volvo, BMW and much more. Ping us if you have anything cool to share on latest cars or on how to make older cars more efficient, or just want to say hi!
Mladen
Hi there, I'm Mladen and I'm an auto enthusiast. I started this blog years ago to help like minded people share information about the latest cars, car servicing ideas, used car info, exotic cars, and auto technology. You will find helpful articles and videos on a wide variety of cars - Audi, Mercedes, Toyota, Porsche, Volvo, BMW and much more. Ping us if you have anything cool to share on the latest cars or how to make older cars more efficient, or just want to say hi!
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