A faulty or loose gas cap is the most common cause of a check engine light coming on in the 2017 Toyota Yaris. The cap is vital in containing all fumes in the tank. If any are permitted to escape, the light is triggered. Replacing or tightening the cap will usually fix this problem. An issue with the catalytic converter is one of the more worrisome causes. The average cost to replace this part on the Yaris is $1,670 to $1,690, including labor. A failed oxygen sensor is a pretty common cause. The engine will still run with a failed sensor, but if it's left unaddressed for long, damage can be caused to the spark plugs and catalytic converter. The check engine light in Your Yaris can also be caused by issues with the spark plugs, spark plug wires, ignition coils, mass airflow sensor, vacuum, hoses, exhaust gas recirculation system, and aftermarket alarm.
Larry J
July 16, 2020
The check engine light on the 2017 toyota yaris is a catch all that is designed to alert you to an issue with the vehicle. It gets turned on when the computer in the vehicle detects an error on the vehicle and stores a trouble code. You can read that code with an obd scanner and this will tell you what the issues is. Common issues can include a loose gas cap, the engine misfiring, d***y spark plugs, vacuum leaks, low oil pressure, and nearly anything else. The light can also come on to remind you to get the vehicle serviced if you are nearing a mile stone. The check engine light is not often a major issue, but it should not be ignored either.
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