Bought a 2004 ford f150 xlt supercab last week with 71,000 miles and the next day I had a flowmaster 40 series installed in place of the stock muffler. It was installed professionally. Within about 24 hours my check engine light popped on. I did some research and was told to un plug the negative side of the battery to restart it. I did this and the light went away for another 24 hours then popped back on. What is the deal with this? I have had no trouble with the truck other then the light and I have put about 100 miles on it already with the light on. I heard that since its a high flow exhaust the o2 sensor may think its a leak. Any one have any advice?

Thanks ahead of time.

 

hopefully sti's post above helped you out, let us know!

 

lol wtf?!

 

Take it to Auto Zone they will check the code for free!

 

check to make sure the plug on the O2 sensor... usually when codes come up immediately, from my experience, its from a circuit malfunction... the person that installed it probably forgot to plug it back in... it happens, we are only human

 

thanks jazar. Is this something that could be DIY.

 

Once you know the code, enter it in a Google search; you will be provided with a wealth of threads to read, and you can then make a decision as to if it's a DIY fix based on your knowledge and work tools availability. Only you know your skill sets, and only you can decide if it's "fixable" by you. Keep in mind that some of these trouble codes can be set by multiple engine sensors and the like; anyone with a full wallet of cash can throw parts at an engine; eventually this method will clear the code.

If you don't have a code reader/scanner in your existing tool box, then you're at a disadvantage already. Yes, parts stores can read your
code(s), and they can offer what they think will fix it, but keep in mind they are not ASE trained mechanics, and they sell parts. I'm also not a certified ASE mechanic, and I also know my limitations.

 

Yeah its like plugging a wire into an outlet... piece of cake