Dumb Question
 

I know this is dumb , but you never know? well i dont anyway. so i bought this 03 concorde a few months ago , it drives nice - small prob with 02 sensors (i think?) anyway the speedo is saying it has 155k on the clock and the engine is just smooth and peppy. well just today i was under the hood trying to see the maker of the current brand of 02 sensors that were replaced in this car (they are new) and i spot , what i think is the vin number on the side of the engine? and it does not match the vin on the dash. i took a pic. is this a vin number? if so the engine has been replaced. i dont mind , prob has less miles on the engine then what the car speedo is reporting. or i could be wrong? just wanna make sure this is also a vin number? but wait now im stumped if its a vin , what if someone was forced to replace the manifold? then the numbers would not match.:confused: i need some sleep.

Attachment 1653

that is just the part number to the intake that's all the other number are casting number etched for the makers.
For you o2 issue only use denso or ntk not bosh

thanks for the reply on the vin part. now onto the 02 part. buddy?

i could not find any maker lables on current 02 sensors , however they look to be brand new. My engine light is currently on so i took it by the local advanced auto parts and they hooked up to their computer and told me i have bad 02 sensors or thats the code its putting out. so say the previous owner did not install the right brand of 02 sensors in the car , would it stall , run sluggish at times , lose power at times? what are symptoms of bad 02 sensors? im curious before i drop $350.

best pic of one i could come up with. gold plate cover , red wire cover.
Attachment 1652

thats a bosh o2 sensor get rid of it

^ thank you for the info CHRYSLER TECH :)