HI, I have a 2007 H3 and check engine light is on. I change the oxygen sensor and reset the light but after some time it jumps on again.
Do somebody know what could be happening?
What I can do to solve the problem?

 

Urgent???

You have a CEL. Not a big deal, certainly not even similar to urgent.

Which O2 sensor did you change? Your code, it it is about the O2 sensor, is the up stream sensor.

Can be tripped by a dirty MAF, a vacuum leak somewhere causing an improper MAP reading (which could also just be a bad MAP sensor), and evan a leaking injector.

Start with the easy stuff. Check all vacuum connections and the intake (under and behind it) where the PCV connections are. Clean the MAF. There are lots of threads on this, buy MAF cleaner, remove it, spray (DO NOT Touch) and re-install it.

check the wires to the O2 sensor for a bad connection, or short, chech the wires to the MAP sensor for the same thing.

BTW I moved this because it is not an FAQ!

 

Hi thanks for the information. I changed the one the is before the catalytic. Sensor 1 bank 1
After that I will check the injectors. I drove the car a couple ok miles and the light went off. Do you know why?
Thanks

 

When a CEL triggers, even if the situation that caused it resolves, it still takes a few ignition cycles for it to turn off.

The front 02 sensor was the correct one for that code, so that may have resolved your issue.

Welcome to the forums.