Quote:
Originally Posted by Chadahar
The other thing is it has High NOS, but less than 100 points over max allowed(that tells me new cats Or maybe just the things we do to get our cars to pass. I/E oil change, new plugs Dist cap, Rotor, filters, ).
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I'd look at vacuum leaks causing a lean condition. That'll raise the NOX quite a bit. When I first took my car to get smogged, right after I bought it, it was way under the average on HC and O2, but almost the limit on NOX. After I fixed the vacuum problems, NOX readings were way down while the rest were slightly up.
Although mine doesn't have an O2 sensor, so that made it a more straightforward issue.