I'm in the process of ordering parts to get the truck in my signature ready for another tow season. The truck has 122K miles and has been well taken care of and runs great. I am going back and forth on replacing the upstream o2 sensors due to age and the mileage.

I'm curious if anyone has done what I'm thinking of doing, and if any improvement has been felt. It's only around $60 to replace them with Denso units. It's not a lot of money, I know, but there's always somewhere else it can go.

Thanks for your input!

 

I also have had the same question but I have never asked. Some of the trucks at work still have the OEM oxygen sensors and well over 250k miles and never been changed due to no trouble codes regarding them. Supposly they have a service life of 60k but who knows...

 

i replaced mine at 100k ,but i was chasing a power problem and spark knock above 3000 rpm. i ended up replacing all of the plugs and coils at the same time. i noticed a improvement, but it could have been the tune up that did it. for the price of the sensors i would just replace them. a bad fuel pressure regulator on the back of the manifold ended up being the power problem i was having.

 

If you do it, don't use Bosch, they are not the same as the original equipment (which I believe is actually NTK). I've always gone to NAPA and bought NTK sensors from them, I have no idea what Denso sensors would do. I've changed them a few times because during the Hedman header debacle, I would just go to NAPA and buy new ones ahead of time "just in case" and just installed them in the new headers.

As O2 sensors age, they detect MORE oxygen in the exhaust (because they don't generate as much voltage, corresponding to the difference between outside O2 level and exhaust O2 level). So they tend to richen the mixture over time. This can cause a decrease in mileage (although slight) but not much difference in the performance department.

Again, I would go with NTK if the original equipment is NTK.

 

Try a can of Cataclean. A few guys I know at shops swear it works great and realy helped their customers cars and trucks.

Cataclean

No interset or involement in the company etc.

 

I think you could use Torque app to log and chart O2 sensor voltage during a drive to determine what the overall average voltage is. Should be 0.5v. If the average is less than that, they could be replaced.

 

I think for the money I'll just replace them. Noticed this weekend that the battery is dead on the truck, so that's got to get handled first. Guess that's the down side of the truck sitting in the winter. Had a solar charger on it but that didn't cut it so bought a float charger for when I get the new battery installed.

It will be a while, since I don't have plans to really drive it till middle of march to head to phoenix for Nascar, but will update once I have some miles on the new O2 sensors.

Thanks for your input, and keep any experiences with the subject coming.

 

Mine set off CEL at 90k. I guess I goofed, I used a Bosch. Freeky,how is the replacement engine?

 

It stacked 10k a week ago when I did an oil change, driver said has a ton more power than the worn out one, he even said fuel mileage went up from 3 fill up's weekly to 2. So far so good (knock on wood).

 

I saw going to get a new diesel, but decided to stick with my v10.