Well kids, the check engine light decided to pay me a visit again this weekend. The first time it happened the OBD codes said I had a lean running engine. I decided to clean the MAF, throttle body, my K&N filter and replace the PCV valve while I was at it. After all of that, everything was fine.... until.

Dateline: Saturday

While going up a steep grade on a freeway, Mr. check engine light pays me a visit and this time it makes me mad! I've haven't the time yet to check what codes they may be yet, but my guess it's probably the same damn thing. My question is this. I've got almost 90K miles on my rig and I'm thinking about replacing my O2 sensors. Is there anything else I should be looking at?

Thanks in advance for all your help, guys!

 

No need to replace both senors....usually on the one in front of the cat wears out (which on your 99+ is actually an A/F sensor not just an O2 sensor so be sure to get the right one for your truck). Pull the codes when you get a chance and see what you get.