johnl848

I have a 2001 Subaru Outback with a PO420 code.The cat has been replaced(aftermarket)and front O2(aftermarket)She has spent $1200 on this light,to her fault,she has not gone after the shop for accountability.Something we are losing at a slow and steady pace!So she put it in my hands,I was a GM tech for 12yrs,left the grind of the dealership for a nice job on the railroad(good move)I have been going through post after post to get an answer to her problem.I called a Subaru tech of mine and he said it was a cheap cat that was installed in the car.He said it was a common problem when they hit 120,000.Thats my advise,put a Subaru cat in it.The reading on the rear O2 range from .2 to .8 pretty fast(with a fluke meter)now this tells me the cat is not doing much.I think if the cat was doing it's job it should be around .4 to .6 on average.Now,if you drove the car with a ignition problem for a while it will foul the O2 sensor(************ rolls down hill) A simple inspection of the O2 can tell you alot,Front o2 Black-problem is not the cat.White with alot of deposites,not the cat's fault.With all these problems I think it's a software problem,too sensitive,like women!

It has 130,000mi. Was wondering if those voltages were normal.I've only delt with o2 sensers that vary 1v.Sorry for the delay in my response,but I just lost a dear friend at the tender age of 48.I didn't want to lose the help to get this problem solved so I can clear this with emissions.Thanks!

I think it's the O2 sensor,but not sure.The voltages are Black-3v steady, Yellow-2.5v steady,Grey-.3v steady,White-7.39 to 7.41v,Red-2.3 to 2.9v.The rear O2 sensor seams to be toggling great between .2 to.8.Can someone point me in a direction?I have to go through emissions