LTU_max

iTrader: (2)

Recently I received a code for P0150 (b2s1) and I bought a universal 4 wire (2 white, 1 black, 1 grey) bosch o2 sensor. When I started to replace it, I noticed that the old sensor is a 3 wire (2 white & 1 black).

Now what should I do with the grey wire on the new sensor? Will it function the same if the grey is left disconnected?

NevadaJack_9

iTrader: (3)

Return it, get an OE fit. Done.

pmohr

iTrader: (26)

Does your universal say what wire color is for what function?

4 wire O2 sensors generally just have an extra ground, whereas the 3 wires don't. For OE sensors, anyway.

ThreePointO

iTrader: (3)

hmm, i jsut bought a bosch universal o2 sensor yesderday and it had 3 wires. It tells you how to match up the wires on that paper they give u.

haydeno

iTrader: (1)

i bought 3 new bosch uni sensors. two 3 wire($40) and one 4 wire. I wish i would have paid the $9 extra to get OE fit($50)

LTU_max

iTrader: (2)

Yep, the grey was a ground. Grounded that wire and now all is good according to my scanner