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Hi all, This may sound stupid, but I have a question about the Bank 1 sensors. My understanding is there are two of them. My car finally settled on the trouble code P1130, which when I looked it up was listed as the Bank 1, sensor 1. So I bought a new Denso sensor to put in. The exceptionally brilliant son of my mechanic replaced the Bank 1, sensor 2 with this one, instead of the one near the firewall (which I understand is sensor #1 and I specifically said to replace). So trouble code is still present. I'm going on about 2 weeks of this game of dropping it off and him "finding" the time to fix his mistake and today my stickers are expired. So last night he supposedly switched out the sensor, putting the old (maybe working) sensor back on the grill side and putting the new one on near the firewall. Now I'm coming up with P1130, P1133, P1135, all of which list the Bank 1 sensor, but the others don't seem to specify if it's sensor 1 or 2 (I'm assuming it doesn't know because the readings are dependent on one another). Dad mechanic has announced this morning that I need to replace the one by the grill "because it looks the same as the other one". I have 2 suspicions: first, he only put the old sensor back on (because it's easiest to get to) and still has my brand new sensor sitting in a box and this is his stall (I always get old parts back from him, but not this morning). Tonight he'll magically fix the problem. Second, he did actually replace the firewall sensor and these new persistent codes are caused by the sensor #2, which he damaged pulling out and replacing. Yes I know I would be replacing #2 soon, I just wanted to get through inspection without spending a fortune and maybe use that to find a new mechanic. So here are my questions: Provided sensor #2 was still working, could he have broken it by the effort of removing it and tossing it around (thinking it was a broken sensor) and then cranking it back in? (He seems to be ever so anxious to find me a replacement part) When dealing with bank 1, should one replace both at the same time regardless? Are they different sensors and does anyone know the part # for both. I have the part # for the one by the grill (because I saw it - toyota 89467-48011), but I wasn't given the old firewall sensor back. When I call for a replacement part, I'm asked which one because they make it sound like they are two different sensors, but when looking them up, I only find the one from Denso. Should I go over tonight with a bat and make an example out of someone? Does anyone know a good mechanic in the Philadelphia region, not in the city and not in Jersey? Thanks everyone!

Hi all, I've done a search for this, but I'm not seeing what I'm looking for. I hope I'm not beating a dead horse here. I don't have an owner's manual for my 99 RX300. I take good care of it and do the basics - oil, filters, etc. I'm getting up there in the higher mileage with this and I'm beginning to wonder what are the recommended scheduled maintenances for this vehicle. Right now I need to replace a sensor, otherwise this car is working fine, but I want to keep ahead of any problems. So does anyone out there have an owners manual and would they mind posting the recommended schedule? I'm looking for when the spark plugs should be changed out, when a tune-up should be done or whatever at 30k,60k, etc. Thanks so much!

So, I took the beast for a highway drive, rechecked the MAF sensor plug (in case I put it on wrong), then put the scan tool back on it. What I have showing up now is P0125, P1130, P1135. I've looked up the codes and they all seem to deal with Bank 1 A/F sensor. This is different from the O2 sensor, right? Other than a bad A/F sensor, is there anything else that can be bringing these codes up, say something really easy to fix with a cleaner or prayer? If it is a bad sensor, is there anything special I need to look for when I go to get the part? Thanks so much for all of your help! Pam

I had a CEL for the initial code, that being the P0171 a little over a month ago. When I cleaned the MAF and put the meter on, it was replaced by P0135. The CEL had remained on for all that time, so I'm not sure if the gas cleaner I put into the tank fixed the P0171, and then I later had a P0135 code or what happened, but the CEL didn't go off and come back on, it was solid for the month. Then I cleared it and ran the car and another CEL came up, this time when I put the meter on it gave me P1130. I didn't touch any of the elements, I just sprayed electronics cleaner on it. I'm pretty sure i put it back together right, it was just 2 screws and a plug. I did take that engine cover off (the one with the Lexus emblem) to check the wires and see if there was anything under there that might have been off, could I have banged something under that? Pretty much all I did was look under there, clean the MAF, replace the air filter, and jiggle all the hoses to see if they needed replacement. I finally got a hold of my mechanic and he recommended I take it for a highway drive, which I plan to do after the snow has passed through. He seems to think it will magically resolve itself, which I hope it does. I'll let you all know if any other codes pop up or go off. Thanks for the responses. Pam

Hi all, Last year, I had a P0171 code pop up. Being cheap and all, I threw some engine cleaner in a tank of gas and it went away (yay!). About a month or so ago, I got another check engine light, and the same code came up. I thought I finally needed to replace the sensor (and I put another bottle of engine cleaner in the tank for good measure), but upon checking this forum, I found that most people reported it was caused by a dirty MAF sensor and the recommendation was to clean it with an electronic parts cleaner. So I did that today and I put the OBDII reader on to clear the codes to see if it would take, but first I ran a test to see if there were any other new codes. The P0171 code was now gone and replaced by P0135. Looking that up it had something to do with water and as my radiator fluid was a bit on the low side, I thought that maybe the second round of engine cleaner had cleaned it up and removed the P0171, and the CEL was being caused by low radiator fluid (I don't drive that often). So I topped off the radiator and cleared the codes. I took it for a short drive and the CEL came back on. This time when I put the meter on it, it's reading a P1130. When I looked that code up for the RX300, it says it's related to the MAF (a short), but in the generic book I have with the meter, it's coming up HO2 sensor. First, I'm confused as to what this error code is referring to. Second, did I destroy my MAF sensor by cleaning it? It was dry as far as I can tell, but I guess there is a possibility that it could have been a little damp way inside (however far inside it goes). Pretending it was damp, would this error fix itself once the unit completely dries, or did I destroy it? Does the MAF have a fuse attached to it that may have been tripped. If so, where is it located? How can I go about testing the MAF to see if it's good (because I don't want to replace it and 3 O2 sensors for nothing). I have an electronic multimeter for testing volts, ohms, resistance, etc, but what are the numbers that I'm looking for and how do I go about testing it exactly? Any help in this regard would be greatly appreciated, as I don't really have a mechanic I can count on and I need to figure this out. :)

:whistles: I was cruising the topics and came upon one regarding the tranny having difficulties after an owner changed the fluid. If I remember correctly, someone who shall remain nameless (because I can't remember their name :P ) said it was because people were not using the super-duper, extremely, astronomically expensive tranny fluid from the Lexus dealerships. So my questions are these: Has anyone changed their fluid using a regular store bought tranny fluid? What brand/type did you buy? Did you have any problems after putting the store bought in? I used to drive a really old junker (yep, you guessed it - a Ford skateboard) that would stall and hesitate if you looked at it wrong, so I'm enjoying my not-really-hesitating-as-far-as-I-can-tell tranny and I don't want to ruin my bliss. I've got a '99 that now has about 60,000 miles on it. Any suggestions regarding this? Thanks