When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hello guys so recently i sent my tranny a little hard and took it to a shop but that’s besides the point , kinda . when i received it back i got a check engine light and a couple codes for the o2 sensor heater circuit ( i’ll show a picture ) but i just want to know what would be the steps to check this out . is this common ? could they have forgot to plug something in? or what could be going on ,
2008 4.6 fx2 crew cab if that helps
Thank you guys
Last edited by vnmtscoat; Mar 21, 2026 at 05:47 PM.
So you are a 2008 F150, 4R75E transmission.
If transmission was removed then O2 sensors were disconnected and exhaust system partially removed.
Check for broken electrical sensors or pinched wires as a first step.
So you are a 2008 F150, 4R75E transmission.
If transmission was removed then O2 sensors were disconnected and exhaust system partially removed.
Check for broken electrical sensors or pinched wires as a first step.
Check for these things jim suggested and also make sure no wires are touching on the exhaust and getting melted.
So you are a 2008 F150, 4R75E transmission.
If transmission was removed then O2 sensors were disconnected and exhaust system partially removed.
Check for broken electrical sensors or pinched wires as a first step.
Check for these things jim suggested and also make sure no wires are touching on the exhaust and getting melted.
Ok so i went under and i found the connection for the o2 sensor straight to the cats on the passenger side isn’t in the best shape . would that one bad connection cause all those codes ?
Ok so i went under and i found the connection for the o2 sensor straight to the cats on the passenger side isn’t in the best shape . would that one bad connection cause all those codes ?
If the fuse blows it takes out both sides, so yeah.
Looks like the trans shop owes you a new O2 sensor
Easy mistake to make
See if they will stand behind their work and offer to replace that HEGO for free
o2 sensor
