I have a 1994 850T that has a few check engine codes and a fuel smell once in a while. It has code 232, 315 and one other that I am forgetting. I am thinking it could be related to the evap valve. Any suggestions to find out for sure?

Your 435 is front Heated O2 slow to respond

The 232 is fuel trim out of rang eat idle

the 315 is the Evap Valve.

Replace the O2 sensor, find where your vacuum leak is at (232) and more than likely replace your evap valve.

My 95' volvo 850 turbo had similar probem , retrive the code is 2-3-2

, I reset computer and I comes back after 1000kms. then I try to reset it

but the error code 2-3-2 comes back immediately.

I don't know where is problem , would you please to tell me what direction I had to check ?

last time I careless disconnected the connector of air mass flow , and my car become powerless and turbo didn't work, I found the problem and connect it back then everything is ok .... I think it's might be somewhere I do somethings wrong ....

Should I try to replace a new oxygen sensor ? and how many o2 sensor do my car have ? (I found one but others tell me two)...

I found the other check engine code, it is 435.