There's a road by my house that floods when the ocean tide is high! I live by the beach. On my way to work yesterday (this is the only way), I drove through it really slow and about a block later, the car started stumbling a bit but kept driving fine. About 4 miles later, I go to take of from a red light and the car just wants to die, but doesn't. RPMS just drop and the engine doesn't respond at all to acceleration. Let it sit a little and it smooths out and let's you drive again, but most times will not go over 40mph without bogging down. If I gun from a stop, sometimes it will just keep accelerating until I let go of the gas, then the pedal is unresponsive again for a few seconds until I let the stumbling smooth out. Never stalls though.
Now, my car is lowered (on Spring Techs) and I have a CAI, but the water is only about 5-6 inches deep. The water barely comes up to the body of the car and the filter is above the foglight. So the engine didn't suck up water. Filter ways dry. Check engine light came on and I scanned it. Had 6 different O2 sensor code; no activity, high voltage, heater circuit malfunction, yada yada yada. Codes were for each O2 sensor (3 codes for each sensor). Basically both sensors are reading the same problem. Looked at the data stream and both sensors are pinned solid at 1.27v. I just replaced the front sensor earlier this week because it had the high volts code and was stuck at 1.27v as well. Put the new sensor in and it was fine, back down to a normal 0.03-0.05v and ran perfectly fine until I drove through the water yesterday. Also, I replaced the secondary O2 back in December. Car has 153,000 miles and both sensors were original.
Also, I have a header and both O2's are extended and are at the very bottom of the car, in case you guys are wondering how they got wet. Connections are good and sealed against water. Thing is, I've been living here for 5 years and drove through the water several times over the years and never had this issue! Even plowed through a bunch of snow over the years.
Anyway, I'm kinda skeptical to just replace both sensors again as it seems highly unlikely that both just went bad from water, although they were probably submerged. Never seen that happen, but who knows. Anyone have any other ideas? Checked all the fuses. All good.