02 sensor

i have a 97 mitsubishi mirage it had a bad o2 sensor .my friend tried to unplug it while the car was running .and the car died and now it wont stay running :crying: if i replace the o2 sensor will this make the car stay running? please help

Usually a bad O2 sensor will cause the check engine light to come on but the engine will run. I suspect something else. Check for another wire or vacuum line disconnected.
FWIW
YMMV

yeah and then pick up another 02 sensor at a like an Advance auto parts or something, they are cheap and should be under 30$.

ok i replaced the o2 sensor that was 85.00 for the one i had to wire myself.the car still dosent stay running.and i now have 4 codes,p0135,o2 sensor...p0115,temp.sensor...p0105,manifold pressure sensor...and p0110,intake air temp.is there anything that i can do before i replace all these parts? or anything that could make them all read bad? can they all go at once?

hey what's up. Yes, there is something that just may cause you to throw codes like this. On each sensor on your vehicle, for the most part, it gets what's called a 5 volt reference voltage sent from the computer. Usually, the 5 volt reference will run to a few, if not all the sensors, all on the same circuit.

It would be possible that when your friend pulled the wiring harness off of the o2 sensor, that he/she damaged the wiring to the sensor, thus causing a problem with a bunch of other sensors. That would be the only scenario that would make sense to me.

If you have some decent auto experience, I would check out the circuits with a digital volt/ohm meter. You can buy one at Wal-Mart in the car stereo section for about $14. Then you check each each circuit's voltage to make sure you're getting the correct voltage readings.

You should definitely do this before just throwing parts at the car. If you do not know how to go about these tests, you should definitely research it. It is not really difficult to do if you don't know how. You pretty much just find out which wires do what on each of the sensor's wiring, and then test their voltages. One wire for each sensor will be the 5 volt reference wire with ignition key in the ON position, or with car running. And if you don't have that 5 volts there, there is probably a break in a circuit somewhere (hint: o2 sensor wiring maybe)

***And also go over the wiring you did of installing the new o2 sensor. Just make sure the wires of the o2 sensor are going to their respective wires of the wiring harness...:)

i first want to say thank you for an answer that finally helps me.......do u know how many places ive been and people ive talked to.......tooooo many..... ill be on my way to walmart in the morning...it sound pretty easy to do the testing......do they give instructions on the box? :) i just ordered a map sensor so maybe with your help i wont need it and will save some money.....is there anything i should know about testing the wires?like will i get electrocuted? :)

ok ive been looking up how to test the sensors and how do u get the wires out to test them? and to test the map sensor it says i need some kina vacume ? heeelllllppppppp

Hey, no you won't get electricuted :)

You might want to find someone who is a mechanic to help you.

Basically, I would test the o2 sensor wiring, intake air temp sensor wiring, map sensor wiring, and coolant temp sensor wiring. (all the sensors that set codes.)

Each sensor will have either 2, 3, or 4 wires to it.

o2 sensor will probably have 1, 2, or 4 wires. If it has 4 wires, then 2 of the wires are for the heater for the o2 sensor. Those 2 wires will be a 12-volt power wire and a ground. The other 2 will be the ones you will test and you should be getting a 5 volt reference voltage from one of them.

map sensor will probably have 3 wires. 1 5 volt reference wire, 1 return voltage wire to the computer and 1 ground.

the coolant temp sensor will probably have 2 wires, and the voltage will vary with that one on it's temperature.

the intake air temp sensor will have 2 wires.

the coolant temp sensor and intake air temp sensors are both variant on temperature changes, (the voltages vary on temperatures)

So I would focus on the o2 and the map, and just make sure you have 5 volt reference voltage on one of the wires for each of those sensors...