O2 Sensor Wiring Question

[therex]

Originally Posted by RETed

Then it looks like your problem is elsewhere other than the O2 sensor and it's wiring...

The O2 sensor generates a tiny voltage (versus the chassis 12VDC).
This is the reason why it uses a shielded wire.

Sometimes people tend to ground the braid shield wires on the engine side, and this creates a "Faraday Cage" effect and screws up the O2 sensor signal.
The only downside is that your mileage suffers slightly, as you just screwed up the O2 sensor closed-loop fuel system.

If you happen to connect +12VDC to the braid shield wires, you get an immediate short, and you get lots of spark and possibly a fried wire.

If you happen to ground the center O2 sensor signal wire, you could possibly damage the O2 sensor itself.

If you happen to connect +12VDC to the center O2 sensor signal wire, you can fry a portion of the stock ECU electronics.
In mild cases, you just killed off the O2 sensor closed-loop fuel system - see above.
In serious cases, you fried the entire ECU and the car will not start / run.

None of it goes through any fuses, unless you blew the "main" fuse and the car doesn't start or run?
Which fuse are you blowing?


-Ted

Ok i see what your saying. Its blowing the egi comp fuse, the 30amp one and it never blew before, only when i put the new o2 in