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Old 08-02-2004, 07:42 PM
chazola's Avatar
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Join Date: Nov 2003
Location: United Kingdom
Posts: 1,239
yay-passed inspection- now what do these numbers mean?!

sorry, just had to share as I was biting my nails all day waiting for my PA inspection test result.

the results were:

CO 0.06 (limit 1.10)
HC 75 (limit 275)
NO 441 (limit 3600)
dilution 8.1%

anyone care to enlighten me on the meanings of these numbers and what they say (if anything much) about the car?


1993 320TE M104

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
"music and women I cannot but give way to, whatever my business" -Pepys
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Old 08-02-2004, 09:39 PM
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
It means, simply put, your engine, emission controls & catalytic converter are working really well.
To simplify:
CO is directly related to fuel/air mixture, HC readings ( if high ) usually indicate ignition or oil-burning problems, NOX is directly related to the EGR ( exhaust gas recirculation ) valve on an engine.
As I said above, these are as close as I can come to translating your readings into layman's terms.

2007 C 230 Sport.
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