Check Engine light after alternator UD install

Jeremy_K

Registered User
Would a voltage drop trigger a CEL? I've had underdrive crank and water pump pullies for some time now. Today I installed the alternator UD pulley. I noticed fluctuations in my voltage but it doesn't go down too far unless I'm running a lot of accessories. I took it for a drive and while coasting or sitting at idle, the CEL light would come on along with a voltage drop. I'm almost positive that the drops are due to belt slippage so I'll be working on that issue. the CEL has me a little worried though cause my car never throws codes.
 
Read the codes.. It could be a voltage issue. The voltage may be low for the oxy sensors to heat up so it could throw a oxy sensor code.
 
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