I have a similar problem but didn't consider the O2 sensor. It was replaced twice, a long time ago, but only after the "engine" light came on. Could an O2 sensor be bad without causing the light to come on?

Thanks.


1989 4Runner Special Edition
22RE, 5-spd.
TG 3" SAS, MC DuaLs, 4.56s, Air Locker
Hi-Clearance panels by
www.toyotafiberglass.com