20V MK1 Engine Swap O2 Sensor in a 85 20 valve

IkoIKo · 06-20-2009, 04:26 PM

I'm replacing the oxygen sensor in my 85 with a silvertop engine. I bought a generic 4 wire sensor and I'm not sure how to hook it up. The sensor has 2 white, 1 black, and 1 tan wire.
Here's what I've found about 3 of the 4 wires on the car:
Black screened wire - Input from sensor
Red w/ Black stripe - Input from sensor
Pink w/ Black stripe - Sensor heater
Black w/ Red stripe - ?

The oxygen sensor wasn't hooked up so I'm pretty sure these are the right wires since these four wires are together in the loom and are the correct length.

Any ideas on the correct connection?

tjmr2 · 06-20-2009, 06:53 PM

I just installed a Bosch universal in my BT. The BT O2 sensor had a blue - signal, 2 black - heater and a white - ground wires. The only two wires that are important to connect correctly are the signal and ground. The Bosch used the black as sensor, 2 white for the heater and gray for ground.

The 89 BGB lists:

Black shielded for sensor input to ECU
Black red stripe for ground
Black and Black white stripe to Heater.

Again according to the 89 BGB you should be able to OHM them out.

1 heater wire will go to the B+ connector in the check connector box.
The other heater will go to HT on the ECU.

1 wire will go to chassis ground.
The sensor wire will go to the OX connector on the ECU.

Hope this helps.

06-20-2009, 04:26 PM	#1 (permalink)
IkoIKo No Skills Join Date: Jun 2009 Posts: 17 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (2/100% )	O2 Sensor in a 85 20 valve I'm replacing the oxygen sensor in my 85 with a silvertop engine. I bought a generic 4 wire sensor and I'm not sure how to hook it up. The sensor has 2 white, 1 black, and 1 tan wire. Here's what I've found about 3 of the 4 wires on the car: Black screened wire - Input from sensor Red w/ Black stripe - Input from sensor Pink w/ Black stripe - Sensor heater Black w/ Red stripe - ? The oxygen sensor wasn't hooked up so I'm pretty sure these are the right wires since these four wires are together in the loom and are the correct length. Any ideas on the correct connection?

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

06-20-2009, 06:53 PM	#2 (permalink)
tjmr2 Cage Fighter Join Date: Jan 2008 Location: Colorado Posts: 409 Thanks: 0 Thanked 62 Times in 59 Posts My Google Map iTrader Rating: (0/0% )	I just installed a Bosch universal in my BT. The BT O2 sensor had a blue - signal, 2 black - heater and a white - ground wires. The only two wires that are important to connect correctly are the signal and ground. The Bosch used the black as sensor, 2 white for the heater and gray for ground. The 89 BGB lists: Black shielded for sensor input to ECU Black red stripe for ground Black and Black white stripe to Heater. Again according to the 89 BGB you should be able to OHM them out. 1 heater wire will go to the B+ connector in the check connector box. The other heater will go to HT on the ECU. 1 wire will go to chassis ground. The sensor wire will go to the OX connector on the ECU. Hope this helps.