Auto Parts and Repairs
Car Computers and Sensors
Emissions and Exhaust Systems
Check Engine Light
VW Jetta

How do you reset the 'Check Engine' light after replacing the O2 sensor on a 97 Mercury Mountaineer?

User Avatar
Wiki User
July 15, 2015 7:16PM

Easiest way is to disconnect the battery cable (negative) for a couple of minutes, then reconnect. This clears the computer. If everything is OK, Check Engine will stay off.