Q: My check light came on possibly due to battery corrosion and poor electrical connection

asked by on July 18, 2017

My check engine light popped on Saturday night. We have had NO problems, good upkeep. I popped the hood checked the battery under the sheath and noticed severe corrosion on the negative end. I cleaned it with baking soda and water and the check engine light went off. 2 days later it popped back on. Did I find the problem and do I just need a new battery and negative wire? Or do I need to pay $100 on top of that for the exact diagnosis codes?

My car has 94000 miles.
My car has an automatic transmission.

Hi There, Generally, the check engine light comes on when something fairly serious is going on with the vehicle. If the problem were related to an electrical voltage problem, the charging system light will usually come on.

The check engine light may come on for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad catalytic converter, bad spark plugs or spark plug wires and many other reasons. Due to the wide range of possibilities for the check engine light to come on, the best and most efficient way to narrow down the scope of what may be causing this is to have the vehicle hooked up to a scanning tool to download any potential fault codes that may have registered in the computer. This will allow a mechanic to determine more specifically what to look for in diagnosing your vehicle. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle to determine what may be causing your check engine light to come on.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

I bought an ignition control module and no one seems to know where it goes. Is it in the distributor fuse box or computer or where

It is in the distributor. Remove the distributor cap, remove the rotor. There are two connectors on the outside, and one on the inside. Be very careful with the one on the inside, it tends to be brittle. Two screws...

What does the Front Camera Blocked, Clean Windshield message mean?

The Front Camera Blocked, Clean Windshield message can appear in the driver information center (DIC). When the DIC displays this alert, it means that the front camera sensor is blocked, and both the Lane Departure Warning (LDW) and Forward Collision...

Can a camshaft position sensor problem masquarade as a timing belt malfunction??

Hi There, While it may be possible that the motor may have jumped time, this is not likely. It may be much more likely that your issue does in fact relate to a faulty camshaft position sensor as this is...

Related articles

A Buyer’s Guide to the 2012 Buick LaCrosse eAssist
Buick Buick has entered the hybrid market in a big way with the 2012 Buick LaCrosse eAssist model. It has all of the same great looks and features that you would expect from a luxury sedan from Buick. However, the...
A Buyer’s Guide to the 2012 Hyundai Sonata
Hyundai Hyundai has been making a real name for itself in the midsize sedan class in the past few years, and the 2012 Hyundai Sonata is no exception. With an attractive price tag, a great warranty, and a choice of...
The Top 5 Selling Cars in Kansas in 2012
Kansas Kansas sees a varied climate with all four seasons, which means drivers in the area choose a variety of vehicles. In years past, some of the front-runners have included the Ford F-150, Buick and Toyota Camry. 2012’s top five...