That orange engine-shaped light just appeared on your dashboard and you immediately want to know: can I keep driving? The answer depends on one important detail: is the light flashing or staying on steady?
Light is FLASHING - Pull Over as Soon as It Is Safe
A flashing check engine light means something serious is going on, most commonly that one or more cylinders are misfiring. The engine is misfiring, unburned fuel is going into the catalytic converter, and it can cause damage. Replacing a catalytic converter is one of the more expensive repairs, so it is not worth the risk.
What to do: Ease off the throttle, do not put the engine under load, and drive to the nearest workshop. If the engine is running very poorly, it is better to stop and call a tow truck.
Light is ON STEADY - You Can Drive to the Workshop
A steady check engine light usually means a problem that is not immediately dangerous, but it does need attention. The car is still safe to drive, but do not use that as an excuse to put off a visit to the shop for weeks.
What to do: First, check the fuel cap. Seriously. A loose fuel cap is one of the most common reasons for a check engine light. If the cap is fine, schedule a diagnostic appointment within the next few days.
Most Common Causes of the Check Engine Light
From our experience, these are the causes we find most often:
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Loose or damaged fuel cap - this causes a pressure change in the fuel system and triggers a fault code. Tighten the cap, and if that was the cause, the light will turn off after a few driving cycles.
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Oxygen sensor (lambda probe) - the sensor in the exhaust that measures oxygen levels in the exhaust gases. When it weakens, the computer cannot properly regulate the fuel mixture.
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Spark plugs and ignition coils - worn spark plugs or weak coils cause cylinders to misfire. This is also a frequent reason for a flashing check engine light.
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MAF sensor - measures how much air enters the engine. When it is dirty or faulty, the engine may run unevenly and use more fuel.
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EGR valve - recirculates part of the exhaust gases back into the engine to reduce emissions. A dirty EGR causes unstable operation and a fault code.
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Catalytic converter - reduced catalytic converter efficiency is a common fault, especially on older vehicles.
Check Engine Light on LPG Vehicles
This deserves a special mention. If you drive on LPG and the light only comes on when you switch to gas, the problem is most likely in the LPG system calibration, not the engine. Poorly calibrated maps, worn gas injectors, or a faulty reducer can all trigger a check engine code. We resolve this with LPG system calibration and diagnostics.
What Happens During a Diagnostic Scan
We plug a diagnostic tool into the OBD port (every vehicle has one), read the fault codes, and use them to determine the cause. It takes 15-30 minutes. It is worth knowing that the fault code itself is not always the final answer. An experienced mechanic knows how to interpret the code in the context of the vehicle's symptoms.
If your check engine light has come on, get in touch or stop by. It is better to check it right away than to wonder about it while you drive.