Back to all

Watching Your Check Engine Light

February 9, 2020

Did you know that most of the cars driving around Appleton, Wisconsin, carry more computer power than the Apollo 121 Lunar Module that landed on the moon in 1969?

New cars sold in the Appleton area have as many as 12 networked computers and over five miles (eight kilometers) of wiring. In fact, for the last decade or so, auto computers have been controlling about 85 percent of your vehicle's functions.

Cars have sensors for manifold air temperature, coolant temperature, manifold air pressure, airflow, throttle position, vehicle speed and oxygen content. All of this electronic wizardry is pretty complicated. So how do Appleton drivers know when there is a problem?

It's simple; the Check Engine light comes on. The computer monitors all the sensors and uses that information to decide what to adjust such as the fuel mix, spark timing and idle speed. In addition, the computer monitors its own circuits. When it finds a fault, it turns on the Check Engine light and stores a trouble code in the computer.

It can be pretty disturbing for Appleton drivers when the Check Engine light comes on. We wonder just how urgent it is. Generally speaking, it is not critical like a temperature or oil pressure light. When you get one of those it means STOP NOW! When the Check Engine light shows up, you should come in to Tuffy Tire & Auto Service Center Appleton in Appleton to find out what the matter is as soon as possible.

Since 1996, there has been a strong emissions control component to the Check Engine diagnostic. But if your Check Engine light flashes on and off, you know that it is more urgent and you need to get it checked immediately to prevent damage. You should slow down and avoid towing or heavy loads until you can get it checked out.

Your friendly and knowledgeable technicians at Tuffy Tire & Auto Service Center Appleton have special diagnostic equipment that will retrieve the trouble code from the computer and help him determine what is wrong. From there, we can fix it and get you back on the road.

Stop by if you're Check Engine light is on.

Tuffy Tire & Auto Service Center Appleton
2940 E. College Ave.
Appleton, Wisconsin 54915
920-954-8500

More articles from Tuffy Appleton

No Fuel-ing! (Fuel Filter Replacement)

November 2, 2025

Your vehicle has a few filters you might be somewhat familiar with. Theres the oil filter that removes impurities from your engines oil, and a couple of different kinds of air filters that prevent contaminants from getting into the engine and the cabin. But you may not know that your vehicle als... More

Making Sense of the O2 Sensor (Oxygen Sensor Replacement)

October 27, 2025

As you know, todays vehicles rely on a lot of computers in them to keep them running clean and efficiently. Those computers depend on information delivered by several sensors throughout the engine and exhaust system. And one of the most important is the oxygen sensor. Known as the O2 sensor f... More

Stop! And See Us (Brake Pad Replacement)

October 23, 2025

If youve ever driven a bicycle with hand brakes, youll probably understand how the brake pads on your vehicle work. Bicycle brakes use a system that squeezes the bike wheels rim with a pair of cushioned pads activated by your hand squeezing the hand brakes on your handlebars. The friction of tho... More