cmfhsu

Thanks for the reply. Any harm done if I let it sit for a while? I've been pretty busy lately.

Lately, in my '99 lx470 there has been an incredibly loud rattle coming from under the front seats. It sounds as if a large marble is being thrown around in the exhaust. The rattle will get louder as I rev it, no matter whether I'm in neutral or not. It disappears at idle, but when I rev it even the slightest bit, it comes back. The rattle is now at a point at which it is actually louder than the engine from 1200-2000 rpm's. This is most likely unrelated, but I'll try to give you as much information as possible. I've had a check engine light lit for a broken 02 heater sensor, along with some heavy misfiring (the two are unrelated). The misfiring seems to have gotten worse as the rattle's gotten louder. If anybody can shed some light on the problem, it would be much appreciated.

I've got a '98 lx470 that's been really faithful and reliable but a few days ago the CEL came on, so i brought it to autozone and pulled the codes. I pulled a P0155 o2 sensor heater circuit malfunction (Bank 2 Sensor 1). I cleared it and drove for about 40 or 50 miles without it turning on again. When i got home however, i took it out and the CEL came back on. I haven't checked the code for this CEL, but i'm pretty sure it's for the same reason. What causes an o2 sensor heater circuit malfunction? I did recently hit a deer and had parts replaced, so do you think that could've caused it?

I've got a 99 lx470 (before all that new electrical stuff got added) and it feels like the car is shuddering at random times, and it usually gets transferred into the steering wheel too. I'm thinking of bleeding the power steering fluid, but can't find the hole to do that. Where would that be (underneath the car). If anybody else has felt this shake and has fixed it, can you help me? (I know I'm cheap, i don't like dealer services because they're usually over $1000! )