Took the '99 Camry in for a smog check, and while it passed, it looks like it just barely passed. Before the test, the mechanic made sure the car had been idling for at least 10 minutes.
Results at 15 mph: NO: 400 ppm (max allowed = 437 ppm) CO: 0.19% (max allowed = 0.50%) HC: 41 ppm (max allowed = 55 ppm)
I guess the NO is the worst of the results. Results were much better at 25 mph.
Any ideas what this could mean? No check engine light was on. Does my EGR valve need cleaning out, or...? I'd changed the oxygen sensor several years ago when it threw a check engine light code at me (with a cheap AutoZone O2 sensor).
Thanks!
Michael