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First off...i drive an 07 LT cobalt..Anyway...i get Po171 (bank 1 system too lean)...thats the first 02 sensor b4 the cat...so i go to the local autoparts place...they want 170 dollars for the sensor....yea...that aint happenin...so im driving my car last night and i look down and the CEL dissapears....now i drive it today and theres no CEL :confused:...god this car is so wierd
 

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FIRST...Don't go back to that local autoparts place...the factory O2 sensor is 1/3rd that price!

When you get a CEL get the codes read and clear them -- it can just be a glitch, maybe moisture from the car sitting awhile or something like that. Don't start replacing anything without checking it out first. Have you already killed your warranty?
 

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someone else has a balt throwing the same CEL. do you have an A/M air intake?
 

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CAI and yea no leaks

MDcobalt2.2 added 0 Minutes and 41 Seconds later...

im gonna clean the maf sensor tommorow and see if that helps
If your CAI is a two piece, then check the joint between the two pieces. if not, check the hump hose that attaches the CAI to the throttle body
 

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the fujita uses the stock intake peice on the throttle body...just connects to the pipe off that
so check that connection for leaks, lol
 

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