Originally posted by QA Inspector:
What is the determining factor in how may O2 sensors the contour has???




1. Year/version of OBD system. The 95 has sensors only in front of the first cat converters(s). The 96-on uses a sensor in front of the cat to monitor the engine's mixture. There is a second sensor after the cat to monitor the effectiveness of the cat.

2. Number of cylinder banks. A Zetec has one bank, the V-6 has two. There is one cat built into the exhaust manifold for each bank.

Therefore:

95 only I-4 has one sensor
95 only V-6 has two sensors
96-on I-4 has two sensors
96-on V-6 has four sensors.

The last cat on the V-6 is not monitored in any way. I don't know if the I4 has a second cat, I've never looked at one.

Hope this clears up the continuous fog, misinformation, and confusion regarding this issue.

Steve

98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!