I've read many M103 reports on here so I wanted to post an update.

Last year, my car barely squeeked past the NOX test by 2points(1047 allow/1045). HC was high and CO was fine(O2 sensor still working I guess) I was concerned because it had about 7,000 miles since the last tuneup which include rotor/cap/and wires.

So, I thought about it all and kept smelling the exhaust with the car hot.

I decided it must be slightly rich, but the O2 sensor was working. I measured 3.5k ohms on the temp sensor(bad sensor -replaced). Then, I did 2 tanks with Techron fuel additive good highway speeds.

Changed the plugs and put a new O2 sensor in the car(hey 86k is enough on the old one and it was $40), changed the oil. Grand total $130 for everything.

Results- amazing!

HCppm 18/21
C0 % 0.02/0.05
CO2 dont remember
NOX 216/312 (1047 allowable).

Hope this is encouraging for others.... I'm in Texas!


Michael

__________________
Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E