O2 Sensors On Tt

[mattanna]

Does the Aristo TT have only one o2 sensor same as Supra TT?

[rallure]

Does the Aristo TT have only one o2 sensor same as Supra TT?

I was told they were, but now i see they are not, the supra is a 4 wire sensor whereas the aristo is 3 wire, unless someone knows any different?

[goodoldgrandad]

As far as I know both the Supra TT and Aristo have TWO heated oxygen sensors - one used at the rear of the exhaust manifold (near rear of turbo) and a sub-oxygen sensor used on the exhaust pipe in front of the rear catalytic converter. Both sensors are I think the same unit, with four wires, connectors as follows:

1. HT (to ECU)

2. +B

3. Oxy (screened sensor output wire to ECU, with screen earthed)

4. E (earth, ground connection)

These can be tested: disconnect electrical connector. Use a meter - resistance between HT and +B should be 11 to 16 ohms at 20 degrees centegrade. If not it needs replacing.

These should be heated oxygen sensors normally, but I have seen people try un-heated versions on other cars (which are ususally just three leads), but these are less stable and not I suspect recommended for the UK mix of weather - particularly in the cold.

[rallure]

my 02 sensor on my mk1 aristo only has three wires, im changing mine tomorrow.

[Ahhhh__Aristo]

As far as I know both the Supra TT and Aristo have TWO heated oxygen sensors - one used at the rear of the exhaust manifold (near rear of turbo) and a sub-oxygen sensor used on the exhaust pipe in front of the rear catalytic converter. Both sensors are I think the same unit, with four wires, connectors as follows:

1. HT (to ECU)

2. +B

3. Oxy (screened sensor output wire to ECU, with screen earthed)

4. E (earth, ground connection)

These can be tested: disconnect electrical connector. Use a meter - resistance between HT and +B should be 11 to 16 ohms at 20 degrees centegrade. If not it needs replacing.

These should be heated oxygen sensors normally, but I have seen people try un-heated versions on other cars (which are ususally just three leads), but these are less stable and not I suspect recommended for the UK mix of weather - particularly in the cold.

On the MK2, the MK1 only has a single sensor.

[goodoldgrandad]

It's 4 wires on my MK2, and seems to be the same as on the GS300. Not sure what's on the MK1 normally, but according to my Workshop Manual it should still be a 4-wire heated Oxygen Sensor, not three. Has yours been changed for a non-heated type?

[rallure]

i don't have a clue to be honest, i had it changed a few months back but because it was located too close to my single turbo its damaged so im replacing it. The only wire that seems to be missing is the earth one as far as i can tell.

[goodoldgrandad]

Is the replacement a genuine Lexus/Toyota part specifically for the Aristo/Supra TT ? Otherwise I'm not sure why they are different !!!

[rallure]

it was a genuine toyota part, ive since found out all mk1 02 sensors have 3 wires.