![]() ![]() The great thing about modern vehicles (1996 and newer) is that they’ll tell you what’s wrong if you ask them. Investigating the reason for your check engine light You need to pull the diagnostic trouble codes from your computer to figure out what’s causing that dreaded light to be on. The reality is, it won’t do a thing if your check engine light is on because you need a new O2 sensor (or any other problem). Searching the internet will turn up tons of results saying that a new gas cap will turn your check engine light off. It’s so easy to throw a bunch of money down the drain by replacing parts you think are the problem. Before you start spending money on parts, you need to confirm the source of the problem. My gut told me that was the issue, but I needed to be sure. This was the last straw for that stupid chord, and I’ve since chopped it off. It was highly likely that I didn’t get the cap to click properly. In my case, I remembered that it was late at night the last time I filled up, and I was fumbling with the tether chord on the gas cap. Something as simple as a loose gas cap is a common reason for these 4runners to act like the end of the world is near. Modern OBD2 vehicles can be very sensitive to minor problems and that’s especially the case with the 4runner. If they all showed up at the same time, it’s likely that diagnosing the cause for the Check Engine light will fix them all. It doesn’t necessarily mean there is an issue with those systems. “VSC Off” and “VSC TRAC” lights will often come on when an error code triggers the Check Engine light. This is likely a common issue with many other vehicles as well, but you’ll need to confirm the problem. It’s important to note that this article pertains to 4th gen (2003-2009) Toyota 4runners with these specific diagnostic codes. Is your dashboard lit up like a Christmas tree? This fix for check engine and VSC lights is both simple and cheap.
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