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SES light on -- what's wrong?

dukbludvl

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dukbludvl Enthusiast

dukbludvl

Posted
Posted

My SES light just came on this afternoon.  It's the steady light -- not the blinking one.  The owner's manual says it's an exhaust system malfunction.  Any ideas of what it could be?  O2 or knock sensor maybe?  

 

I have heard a ticking sound at idle -- seems that it started after I replaced the stock spark plugs with copper plus plugs about 3K miles ago.  I thought ticking might be a belt, but I'm not sure.

 

Also, will a place like AutoZone or Advance Auto Parts read the codes to see exactly what the problem is?

 

Please advise.  Thanks.

 

Jon

SportyShorty Enthusiast

SportyShorty

Posted
Posted
Yup, mine was on a few months ago.  Took it to the dealer and it was an O2 sensor.  They cleared the code and it hasnt come on since.  Now to only fix all these hard shifts
stebob Enthusiast

stebob

Posted
Posted
I have the same prob.  I get codes 172 and 175 (rich bank 1 and bank 2)  Replaced the O2's, reset the computer and still have the same prob.  I've cleaned my throttle body, replaced fuel filter, replaced air filter, made sure all hoses connected, replaced gas cap. Stil....   I guess I'm gonna have to break down and have diag. run on it.  It runs good, though.  Funny thing about it.  The light will come on for a few days, go off for a day or 2, come back on.  Just repeats this cycle.  Any ideas?
Greg Senior Enthusiast

Greg

Posted
Posted
On my Avalanche, the steady SES was solved by loosening and retightening my gas cap and driving 5 trips.
dukbludvl Enthusiast

dukbludvl

Posted
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Posted

Just wanted to update you all -- thanks for your responses.  I had my code read at AutoZone for free on Friday when the light first came on -- it was P1154 (P is for powertrain).  Called the dealer and they told me it was the pre-catalytic converter O2 sensor.

 

Well, later that night the light went off and it hasn't come on since in about 5 trips and 200 miles of driving.  So, my question is, does this mean I actually need to replace the O2 sensor?  Can the truck really tell if it's bad, or is the computer set to trigger that code after a certain number of miles or engine hours.  I'm just shy of 50K miles (about 49,250) and I'm at about 1370 engine hours.  

 

Should I spring for the $90 to replace the sensor now, or wait another 10K or 25K miles?  

 

Thanks.

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