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I have a 2003 Ford Escape 3.0L,I had a CEL light for a P0430, Catalyst System Efficiency Below Threshold (Bank 2), and my RPM’s would not go above 2500 unless I floored it. I believe this was from a bad coil and vacuum leaks I inherited with the car.
I was confindent I had a clogged Cat so I purchased a tested used part due to budget, pulled it off and replaced. After clearing the CEL, I started in upper and it sounds good but both B1S2 and B2S2 02’s are reading a consistent .750mv. I do not think is normal, thought it was supposed to be around .45mv? Any ideas as to why both banks are reading consistently rich?
Both upstream o2s seem to be fluctuating nicely, starting to think i have a fuel delivery issue due to both banks being rich. Any thoughts would be appreciated.
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haha ok i going to look for that extra fuel line. Thanks for getting back to me, I am just a bit paranoid a I will lose another expensive cat. I didn’t mention but I am also trying to make sure the numbers are good before I have to get my car inspected in my state of PA. Once again thanks for the help.
I’m with the group. Don’t look at the downstream O2 sensors to validate a rich condition. The front O2 is on the front lines. Look there if you suspect a rich condition. In addition, if your mix was out of spec it would likely set a code. The fact that you don’t have any codes indicates that the computer doesn’t see anything out of spec at this time. That’s something to be considered here in my opinion. So your LTFT is a little high, there could be a lot of things that could effect that but once again, it’s no so bad the computer is setting off alarms.
[quote=”T.Dallas1215″ post=103996]haha ok i going to look for that extra fuel line. Thanks for getting back to me, I am just a bit paranoid a I will lose another expensive cat. I didn’t mention but I am also trying to make sure the numbers are good before I have to get my car inspected in my state of PA. Once again thanks for the help.[/quote]
Not a problem, it’s understandable. Cats are exp, and so are out of date tag citations. 😆
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