How to Reset Check Engine Light , Why it Turn On

The Check Engine light is one of the most unnerving indicators on the dashboard for drivers. Is it really that scary and what to do?

If the Check Engine icon briefly turns on in the car’s self-diagnosis mode after activating the ignition, there is no need to worry. However, a long-term glow of the stylized engine outline in orange or yellow may indicate either a serious problem with the power unit or a single failure recorded by the control unit. Only diagnostics, which is best left to a professional, will help you understand what’s what.

One thing is certain: the appearance of the Check Engine icon is a reason to quickly figure out the causes of this incident, and there are many of them.

Some are very or relatively easy to fix.

The fuel tank cap is open. The steps are clear: it needs to be closed.

Low-quality fuel. You will need to drain this “chacha” and refuel at a trusted gas station.

Low engine oil level. If the lubrication system is sealed, it is enough to add oil.

Moisture entering the engine control unit connectors, for example, after improper washing or driving through a deep puddle. If you have access to the connectors, they should be immediately blown out.

Other detected faults are more difficult to deal with.

Failure of any sensor or/and damage to its wiring. You can’t do without good auto electrician skills here.

Fuel pump malfunctions range from simple blockage to electrical problems.

Severe contamination of the throttle valve and/or EGR valve, which is responsible for exhaust gas recirculation. It can be very difficult to get to these systems yourself and clean them correctly.

Contamination of fuel spray nozzles. Special equipment is required for cleaning.

Ignition system malfunction. It is possible that a simple replacement of “expired” spark plugs and/or high-voltage wires will help, but perhaps the cause is deeper. An auto electrician should be able to help with this.

Failure of the catalytic converter or/and particulate filter. The problem can only be solved at a service center.

Malfunction of the automatic transmission in the absence of a separate indicator of the transmission’s health. A depressed “automatic” can only be cured by a qualified specialist.

Can I drive if the Engine light is on on my dashboard?

The Check Engine icon on the dashboard is not a prohibiting road sign – there are options here. Modern electronic engine control units have a built-in program that allows you to continue driving in “emergency” mode with speed limits and without sudden acceleration if a number of sensors fail. However, you should stop if:

The car’s behavior has changed noticeably: the engine speed fluctuates, and strong vibration has appeared;

There is a burning smell;

At the same time as the Check Engine, the high coolant temperature and low oil level indicators came on.

And if the crankshaft position sensor fails, in the vast majority of cases it will simply be impossible to continue driving. If it is impossible to replace this component on the spot, then only a tow truck!