Oxygen sensor splicing question...
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AudiWorld Super User
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Oxygen sensor splicing question...
I STFA'd and found lots of discussion of OXS sensors and 3 and 4 wire splicing, etc. but no discussion on the actual how-to.
I have a generic 3 wire version that I will need to splice to replace mine...BUT...I'm a wiring moron. Anyone know of any write-ups or have any advice/how-to's for doing this process?
Thanks guys!
--morgan
I have a generic 3 wire version that I will need to splice to replace mine...BUT...I'm a wiring moron. Anyone know of any write-ups or have any advice/how-to's for doing this process?
Thanks guys!
--morgan
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Joined: Jun 2002
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3 wire
There is a solitary wire coming out of the sensor. That is the Oxs output. It sends out voltage to the ECU. There is usually a grounded shielding wire around that wire which goes nowhere on a 3 wire setup.
The other two wires should be bundled in a standard 2 pole AMP Bosch connector. That is the heater wires. One is +12V (high current) the other is a ground. The heater pulls several amps so you want to run that with a relay triggered by ACC power.
The other two wires should be bundled in a standard 2 pole AMP Bosch connector. That is the heater wires. One is +12V (high current) the other is a ground. The heater pulls several amps so you want to run that with a relay triggered by ACC power.
AudiWorld Senior Member
Joined: Apr 2003
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just did this myself
Drop the cat, snip the wires close to the cat, bust off the O2 sensor, drill out sensor, tap threads, insert new three wire "universal sensor". match white wire to white on the socket and match black wires to black. Don't think it matters which one (my guess is they both are hot leads, ie+12V) - one goes to the heating element, the other for the sensor and the CPU reads the voltage off the white lead.
Now for the real tip. If you bought the generic Bosch, it comes with connectors and thermal shrink insulating wrap. Strip the wire back about 3/8 inch. Slide the insulating wrap down one of the wires. Connect the two wire ends via the connector - DON'T CRIMP YET - now slide the insulation over the connectors and crimp. Use a heat gun to seal up. If you can pull of the entire O2 wire and connector ends its easy. (or you can be like me and do the crimping while under the car - duh...)
Now for the real tip. If you bought the generic Bosch, it comes with connectors and thermal shrink insulating wrap. Strip the wire back about 3/8 inch. Slide the insulating wrap down one of the wires. Connect the two wire ends via the connector - DON'T CRIMP YET - now slide the insulation over the connectors and crimp. Use a heat gun to seal up. If you can pull of the entire O2 wire and connector ends its easy. (or you can be like me and do the crimping while under the car - duh...)
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