1996 BMW 328 FAILURE EMISSION

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode

i changed the senssors, the o2, and the fuel pressure regulator and i still have the same problem. What suggestions or what other solutions are there?

How about the rest of the stuffs do they checked out also??

does the coolant really hav to do anything wit my problem ?? my car tells me to check the levels of the coolant but the levels are all fine or is it possible that its the cars computer and the code was PO600

P0600

This code indicates that the computer PCM has lost of serial communication link, the PCM will need to be replaced to repair this problem.

what is PCM??

The computer-PCM (Powertrain Control Module)

I reprogramed the computer, the specialist told me to check the basics first and go from there, like check spark-plugs,coils,any vacum leaks which i alredy did and he told me that the oxygen sensors are reading to rich, besides those two codes two new other codes appeared P1188 and P1189 sometimes it detects the cylinder codes as a problem but it goes off right awway sometimes two codes and other 3 or more what do you recomend doing from here?