Hello members. The archives had no food for thought on my query so here it goes.

My 1989 300SE (W126) went in for a smog cetificate (California) and passed the all emission tests and visual tests but failed the functional test because the 'Check engine light' would not illuminate.

"Please check bulb" was the suggested remedy.(come back for retest)

Question is, does this bulb exist or is the 'check engine light' illuminated by another typre of light source?
If it has a light bulb, how do I get to it without massive disassembly?

Any other possible causes for the non-illuminating dummy gauge?

Thanks

Denis

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD