Oxygen sensor wiring diagram.

Adele · 2025-09-11T02:06:40-0400

Hi
The electrical wire pins have pulled out of the plug in the downstream oxygen sensor (has 2 this one is the one away from the engine). It has 4 wires and I don't know which wire connects to which.
Is a suzuki SX4 2009 hatchback.
Wire colours are blue, white, 2xblack. Other side is yellow, blue, red, black/red.
Any help would be greatly appreciated

LMP · 2025-09-11T08:22:02-0400

ENgine type ?

Adele · 2025-09-11T16:57:47-0400

Hope this helps. 2.0L J20B DOHC 16v petrol 4cyl 112kW hatchback

LMP · 2025-09-11T18:06:55-0400

well...2009 and J20B is an uncommon combination. Though different markets can have different options. The J20B arrived in North America only in 2010....and I just have diagrams for the J20A
which seems similat to the former one that was for the M16 and probably the same (for O2 sensors) if J20B

Adele · 2025-09-11T18:20:32-0400

Thanks heaps for that.

aquanaut20 · 2025-09-12T10:40:54-0400

Regardless of colour combos, the 2 common colours are always the heater (no polarity).

Of the others, One is a ground (Ohm it) the remaining will be the signal return to the ECU

Adele · 2025-09-12T16:11:35-0400

Thank you for that.
So when you say "the 2 common colours are always the heater (no polarity)" do you mean the 2 wires of the same colour can be put in either of the heater positions?
Thanks again

aquanaut20 · 2025-09-12T19:37:39-0400

The heater circuit is power and ground, with a filament in the sensor to bring it to temp, that is why it does not matter the polarity on the common colour wires.

Adele · 2025-09-12T20:19:06-0400

Sorry I have no electrical knowledge. Does that mean the position of the 2 black wires are interchangeable?

fordem · 2025-09-12T21:55:41-0400

Adele said:
Does that mean the position of the 2 black wires are interchangeable?

Yes.

Adele · 2025-09-12T23:23:20-0400

👍 thanks

Oxygen sensor wiring diagram.

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