I bought my car about a month ago and it has no cats or 02 sensors. I'm wanting to get better every day mileage and install some 02s. Has anyone done this before and how is it done?
They turn counter clockwise to remove & clockwire to install, one plastic wiring connector per sensor. Bosch O2 sensors are usually about $45 each. Don't use too much antiseize around the first threads as it will damage the sensor if it gets on the business end of it.
Before you replace anything, dump the codes and see what the computer says is wrong…
Here's the link to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for years, and it works great.
IF your car is an 88 stang, you'll have to use the test lamp or voltmeter method. There is no functional check engine light on the 88's except possibly the Cali Mass Air cars.
Codes have different answers if the engine is running from the answers that it has when the engine isn't running. It helps a lot to know if you had the engine running when you ran the test.
Trouble codes are either 2 digit or 3 digit, there are no cars that use both 2 digit codes and 3 digit codes.
For those who are intimidated by all the wires & connections, see http://www.actron.com/product_detail.php?pid=16153 for what a typical hand scanner looks like. Normal retail price is about $30 or so at AutoZone or Walmart .