I recently replaced the 02 sensors on 1999 blazer, now it won't start
I replaced spark plugs but it didn't help
any ideas on what could be the problem
Thanks

 

Is it spinning over just won't crank up?

 

yes it spins but just won't start

 

I assume that it was starting just fine before the work was done on it.? Have you gone back over everything that you replaced as well as everything in the area(s) where you were working?

Have a look through the thread linked to below:
No-Start - Engine Cranks OK - Ignition System Diagnosis

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check for spark n fuel. might b an unfortunate coincidence. fix one thing n something else breaks. o2 sensors shouldnt cause a no start