2000 Pathfinder O2 Sensor heather element failure

[rseda]

Recently I replaced one of the O2 sensor due to a heather failure. This sensor short circuited with the body since the cables weren't properly placed to avoid metal contact. This short circuit blew the sensor fuse. The sensor and fuse were replaced but now all four sensor are reading heather element failure (ECM code read). I don't have current going to the heathers element on the sensors. Could it be that the short affected the ECM?

[NISTECH]

It is very possible. First check to make sure voltage is available to the sensor. [it isnt blowing the fuse immediatly on install]. Then again check for that same voltage at the appropriate wire at the ECM. If you find the voltage is able to reach the ECM. You probably fried the heater driver in the ecm. I would only go hear as a last resort after completing all tests. I have a bit of reservation about the ecm due to it being all 4 heater circuit codes. Since they all recieve power from the same fuse and then split off in the harness to individual circuits I am leaning more toward the fuse side of the circuit having a problem.

Also keep in mind when replacing the rear O2's on a 2000 pathfinder your suppose to reprogram the ecm to stage the heater operation so they dont burn up.

There is also a TSB about getting moisture in the connectors located on the R/H valve cover. If they get water in them it can cause these same codes. The TSB states to replace the entire engine harness and all 4 sensors with updated parts to resolve the problem.