Check engine light, 02 sensor, and ignition switch
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Postmaster
Joined: Jun 2001
Posts: 2,809
Likes: 3
From: Loveland, CO.
Check engine light, 02 sensor, and ignition switch
I kept getting the "check engine" light on my 90, it was intermittent, and always said the 02 sensor. I put in three 02 sensors. As it turns out, I started having electrical problems. I lost power to a couple of fuses and was going to rewire them to the battery with a relay, however it was traced it to a faulty ignition switch (not the cylinder, but the switch). The upshot is that this circuit also goes to the 02 sensor. Since replacing the ignition switch, everything is back to normal. So this is just one thing for you to check if you are having an annoying check engine light problem. Now to tackle my passenger side exhaust manifold...
Senior User
Joined: Jan 2003
Posts: 117
Likes: 1
Check engine light, 02 sensor, and ignition switch
I found that when I installed headers on my 90 Bronco that all the work went A LOT easier if I just removed the plastic inner fender on the passenger side. That's after going to all the trouble of removing the stock exh manifold with the fender installed.
