Quest/Villager van trouble codes

[glorifiedpaperboy]

My '99 van tripped three trouble codes:

P0325 knock sensor fault
P1148 closed loop control fault
P0135 upstream O2 sensor fault

Any ideas what might cause this combination of codes?

Thanks

[DanD]

It would be hard to say why these codes all set, where I would start would be to clear the codes and drive it to see whether any or all three came back. After that it may give us a little more of a direction to go in.
Sorry but that’s all I can think of right now, with out getting involved with actual voltage and resistance checks.
Dan.

[glorifiedpaperboy]

Thanks for the fast response, Dan.
A couple of months ago my van tripped the P1148 code along with the code for th downstream O2 sensor, but not the knock sensor code.
At that time I replaced the downstream O2 sensor.
Everything seemed fine until the three described codes were tripped.
Maybe this helps

Thanks!