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I haven't replaced anything yet, I've just done a quick preliminary inspection, checked plugs, viewed codes and engine data. The owner doesn't have a lot of money to stick into his car so I'm just trying to gather up as much information as I can before diving into this repair. I'm not starting a...

Can anyone confirm that these replacement sensors work long term and do not leak? I have a vehicle I'm working on and desired vs actual FPR are pretty much the same but the readings fall on its face every so often. We have a used replacement rail with factory sensor but if we can change just the...