Real quick; my SERVICE soon light just come on. I figured it just needed a oil change but i turned the key halfway and i cant find a CHECK engine light. Runs fine but just wondered if the blazers (2001) even had a check engine light or if the service light means i got a problem. Thanks yall

 

They do have a check engine. Its on the left side, in the shape of an engine. Yellow in color.
I'd get it scanned. See if it's throwing any codes. I don't think the service light would come on if you need an oil change. I don't think the Blazers have oil life sensors in them..

 

You only have the SES light according to the 2001 Owners Manual (pg 2-86 & 2-87 for the instrument clusters).

Get the codes read and we'll go from there.

 

oh i was afraid of that. Cause i just had a flowmaster muffler put on a couple weeks ago. Ill get the codes run and get back later today

Thanks too cause i aint got a manual lol.

 

sorry its been so long. Internets been acting up

Ok so i got it checked and it was the secondary air injection system. I cleared it out but it come back on about a week later. My dad says it may be the pump or, we just had a foot of snow here, and that maybe the moisture set off the sensor. But what do yall think?

 

What was the code number?

 

Oh shoot i dont remember. and i done cleared it again. P90421? P90420? somethin like that. I just know it said SECONDARY AIR INJECTION SYSTEM.

We got 13 in of snow and still falling so theres nothing i can do now anyways. If it comes back on i can get you the number... but i think it was P90420

 

P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

P0421 does not come up as being a valid code.

If you are sure it was for the AIR system, then this is the code pertaining to that:
P0410 - Secondary Air Injection System

 

Yea then its definately that P0410. I had just been guessing at the number. But i know its the secondary air