miataguy

I just replaced my O2 sensor with a universal 4 wire bosch, but I am still getting check engine error code 1(it blinks once every 5 seconds). What could be wrong? BTW, i have a b16a2 swap with P72 ecu.

eg6ajk

check your wiring. trace the conections and see if you're getting anything.

also have you resetted the ecu, after the installation?

couter.net

you had a 5 wire o2 sensor before right?

i had same problem every 1 here said get a new o2 sensor which is not the case

you need to run the orange/blue wire from the firewall side to the white wire on the harness

don't mess this up b/c i did now my car dosen't start

miataguy

The existing O2 sensor was 4 wire...i just spliced the new one on. Do i need to do anything special to reset the ecu? I thought you just needed to disconnect and reconnect the negative terminal on the battery

BlVlW313

damn i got the same damn problem. i replaced my o2 sensor. but my cel keeps coming on. (not right away but after im takin in into high rpms) i got a gsr swap and im runnin the si ecu.

couter.net

which car do you have

i had same exact problem it was from going from 5 to 4 wire o2

BlVlW313

i have a 99 civic dx. and i am currently using a 4 wire o2 sensor. and the one that i replaced was also 4 wire.

BlVlW313

ttt

stevel

well, did you splice the 02 sensor in right? On the bosch universal ones the black wire is the sensor wire, not the ground. I did that initially myself. Might be something to check.

s

miataguy

I spliced the two blacks to two blacks, the white to blue, and green to white, according to the instructions. Is this not right?

miataguy

Anyone know if the above wiring is correct?

miataguy

anyone?

stevel

sounds right from memory. the bosch universal I got had 2 white wires, a black, and a gray. little different but it looks like you did it right. have you hooked up a voltmeter to it to see if it's working correctly?

s

miataguy

I've replaced the 02 sensor with an oem denzo, and it still doesn't work! I've replaced the ecu with a chipped p28 in the mean time so it can't be the ECU. I don't know what to try next.