Hi i was thinkin if thers a reason some o2 sensors have 1 wire and some have more sorry if its a stupid ? thanks for your help.
-1999 Cavalier Z24-
dont know why but i believe the ones with 2 wires are in the 00+ and the single wire ones are in the 95-99's
ya becouse summit has them listed for 95 to 99 cavaliers with the 1 wire and 2 wire o2 sensors.
-1999 Cavalier Z24-
do you need a sensor for something or just asking the question in general? pm john lenko, he will tell you the difference between the 2. i dont believe there is a difference though. i believe that the fact gm changed all the wiring in the 00+ is why it has 2 wires.
i think i might need 1 my fuel economy is bad and i read it could be that.
-1999 Cavalier Z24-
The older 95-99 ones used the exhaust manifold itself for sensor ground... the one wire was just a signal. The newer 00+ uses a separate ground wire to eliminate noise and ground loops. More reliable
Some have 4 wires... heated O2 sensors. So there isn't an issue with the sensor having to wait til the exhaust warms up (tho it does that PRETTY QUICK!) to get accurate readings. Some people even retrofit the heated sensor onto older cars to alleviate other issues.
John Lenko wrote:Some have 4 wires... heated O2 sensors. So there isn't an issue with the sensor having to wait til the exhaust warms up (tho it does that PRETTY QUICK!) to get accurate readings. Some people even retrofit the heated sensor onto older cars to alleviate other issues.
Its also a good swap for when you add a header to any of our cars and the O2 sensor gets moved down to the collector, that will let the system go into closed loop alot faster.
