from memory i had fault 45 ox2 sensor high (rich) i may have to cheak again cause somtimes the engine light does light up and goes away. i had trouble with codes due to the car running a v6 memcal but i fitted the right memcal when i found out people before me where running the v6 one in it. might have to try the 02 sensor maybe see if it makes a diffreance i wouldnt of through it would been somthing that only reads the exhuast gases passing through it
fitted a new oxy sensor and new air filter as well problem is still there, its had new leads and plugs put in. onhly other things left are fuel reg maybe leaky injectors.