O2 Sensors on Escape 2.3L

[badtlc]

How difficult is it to replace the oxygen sensors on the 2.3L in an Escape? The escape has enough miles on it I'm thinking it might be a good idea to replace them soon.

 

[zzyzzx]

How many miles?

 

[fredfactory]

Why? The engine computer OBDII will tell you when they fail, reliably.

 

[Chris Meutsch]

Originally Posted By: fredfactory
Why? The engine computer OBDII will tell you when they fail, reliably.


Because they get lazy over time without throwing codes. They then hurt fuel mileage by running richer than they need to.

 

[badtlc]

Originally Posted By: zzyzzx
How many miles?


almost 125k.

 

[cptbarkey]

follow the exhaust manifold from the engine. you'll find both sensors. have pb blaster ready, the right sockets, and a cheater bar. good luck.

 

[silveravant]

Don't bother changing the one after the cat. It's only purpose is to turn on the CEL.

 

[Quest]

top O2 sensor? (the wideband one)?

or the bottom one?

Q.

I'd still replace it if it's the top one.

 

[badtlc]

Originally Posted By: Quest
top O2 sensor? (the wideband one)?

or the bottom one?

Q.

I'd still replace it if it's the top one.


There are only two I think and I was going to replace both if it was easy enough.

 

[cptbarkey]

Originally Posted By: silveravant
Don't bother changing the one after the cat. It's only purpose is to turn on the CEL.


what?

 

[bdcardinal]

Originally Posted By: cptbarkey
Originally Posted By: silveravant
Don't bother changing the one after the cat. It's only purpose is to turn on the CEL.


what?


There is a reason why Ford calls the rear O2 a catalyst monitor. It does not check fuel trim, just monitors catalyst efficiency.

 

[zzyzzx]

Did you replace it yet? If so did it make a difference? Probably too early to tell, but I've got 140K miles on a Bosch O2 sensor with no dash light and have been wondering if I should get a new one. 30MPG in an Escort isn't too good.