I have 2003 Mitsubishi Montero and for last 2 weeks, I am getting "Service Engine Soon" light on.

Question

I went to Autozone to run a free diagnostic check and found out that I need a O2 Sensor OEM Brand: OBDII (Bank 2 Sensor 2). I would like to order it online and then get it fixed by an outside mechanic rather than have Autozone order which would cost me more than $300.

Could anyone suggest a good website where I can order this part?

I would appreciate anyone helping me in this sitaution.

Thanks.

Answer 1

just about anytime a code shows up on a scanner the o2 sensor also shows a code. this is because the o2 sensor is at the *** end of the car and anything and everything affect its operation. but it does not mean there is anything wrong with it.

And cars are different. sometimes these things show a code after so many miles because it reminds you to get an oil change.

Did the fella at Autozone clear the codes for you??

And if he did ,,,did the lite com back on again???

And when he ''scanned'' your car,,,what were ALL the code NUMBERS ??

Answer 2

Alvarez makes a lot of good points.  Autozone just wants to sell parts however.  They quite turning off the check engine lights however because they were costing shops money in diagnostic time and then shops didn't buy parts form them.  

O2 sensors can set a code and it just be a clitch.  Also it could be a sign of other problems, then you change the O2 sensor and you really needed an induction service or a tune up.  It all depends on the code for the O2 sensor.  A lean or rich code may have just been a temporary condition the engine went through for one reason or another and it caused it to run rich or lean for a brief moment and the O2 picked it up.  If it's an O2 heater code then all you can do is replace it.

I would see if you can get the light turned off one time and drive it and see if it comes back on.

Also, you could have a catalytic converter problem because that O2 sensor is after the Cat.

If you need the sensor.  The left side is $218 or more the right side is $115 or so.  I'm assuming based on what you said it must be the left side according to autozone but see this is why I don't like Autozone selling parts by checking your vehicle instead of a mechanic checking it because Bank 2 Sensor 2 is usually the right side........not the expensive left side.

Answer 3

I guess their free dianostic check isn't so "free"