Always finding out new things, often correcting issues or problems that we see. In this case it was an odd reading from an oxygen sensor. This car originally had a Power FC, so it may have just been ignoring the factory oxygen sensors.
I changed ECU's on the car, and while checking out the readings, one 02 sensor was reading normally. The 2nd sensor was reading maximum, or 2.55 volts. Unplugging the sensor, I saw 0 volts. So first thoughts are of course, the sensor is bad. However I also thought it could be the wiring. Since this car didn't have stock R32 sensors, it was always a chance. After looking it the wiring diagram, then pinning out what I saw, I thought that two pins were swapped.
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| RHS 02 sensor showing 2.55 volts. LHS 02 sensor showing 0.54 volts |
Factory sensors are what we normally call a
narrow band 02 sensor. So if you are putting an R33 or R34 engine/turbos/outlet tubes in your R32 GT-R, and want the factory 02 sensors to "work", then you have a few options
- Run factory R32 GT-R outlet pipes and factory 02 sensors
- Run factory R32 GT-R 02 sensors with an adapter to fit the 12 mm sensors in the 18mm holes
- With R33/R34 sensors, swap two pins on the square 4 wire connector on the 02 sensor or chassis wiring. This will at least get the signal and power wires to the right spots to/from the ECU.
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| Pin #1 and #2 swapped on the harness side of this R32 to match the R33 sensor wiring. |
The factory R32 GT-R oxygen sensors are titania sensors, and use a resistance value to give exhaust feedback to the ECU. The factory R33 GT-R oxygen sensors are ziconium, and work on a voltage to give feedback to the ECU.
Read more oxygen sensor information here.
They are also different sizes. The R32 GT-R sensor have a 12 mm thread, and use a 17 mm wrench to remove. The R33 GT-R sensor have a 18mm thread, and use a 22mm wrench.
R32 (11/16th or17mm nut)
13.2 - 17 ft/lbs M12 sensors
R32 GTS-t Oxygen Sensors
R33 and R34 Nissan Skyline GT-R 02, Oxygen Sensors
- Alternative - these may require connector/pin swaps
- Denso 234-3087 flat longer wire
- Denso 234-3089 flat
- Bosch 13091 flat
R33 GTS-t Oxygen Sensors
R33 (7/8th or 22 mm nut)
13.2 - 17 ft/lbs M12 sensors
R34 GT Turbo RB25det NEO
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| R33/R34 oxygen sensor wiring with pin out. The flat plug wiring is the same, the square plug wiring is not |
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| Notice the color of the middle pin. Gold/brass color. This is the signal wire. The same on R32/R33/R34 |
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| Notice the color on the upper right pin, which is pin #1. It needs to be moved to spot #2(lower right) for the reading to be correct. Then #2 pin to the upper right. |
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| Two pins swapped, both 02 sensors reading normally |
Depinning GT-R Oxygen Sensors
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| Remove the lock |
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| You can try the feel of the release on the empty pin. You also want to push all the terminals/wires in from the backside. This frees up the retaining clip. IMPORTANT! |
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| You can try the feel of the release on the empty pin. You also want to push all the terminals/wires in from the backside. This frees up the retaining clip. IMPORTANT! |
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| Pull on the wire once the clip lock is released |
R32 Oxygen Sensor wiring
We have to move the pins around as many of the replacement oxygen sensors we use only have the flat 3 pin connector.
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| Square connector or forward 02 sensor with stock sensor wiring. Flat is rear. |
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Square connector or forward 02 sensor with stock sensor wiring. Flat is rear.
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