adam.sh

It does some... Biiiig Thanks :D Where did you manage to find it? Cheers, Adam.

Cheers for that. So that would suggest the 1.4 reading I got is bad. The plot thickens as I believed that sensor to be OK!! Why is this so hard? Thanks again for your advice. :)

Hi All, Just posting a link to this topic in the maintenance forum in case anyone here on the RX forum can offer any advice on which sensor is which. Cheers lots...

OK, so been doing a spot of further diagnosis and further research before I decide if I'm going to do the job or not - results inconclusive though... Firstly, there seems to be an error in some of the fault code lists I've found on-line. Let's try and set the scene. My error code is P1135, which according to everywhere I can find means a problem with the O2 sensor heater circuit on Bank 1 Sensor 1. Not knowing for sure which sensor that was, I decided to unplug any I could find on the car and read the fault codes again, theory being that when I unplug the one that is already faulty, then I wouldn't get any new fault codes. So, the first one I unplugged was the one in the exhaust manifold on the front side of the engine, sticking out towards the battery. This gives me a new fault code, P1155, which most sites report as O2 sensor heater circuit Bank 1 Sensor 1. Hang on a minute - that's exactly the same meaning as a P1135 for exactly the same sensor. So, some more research on the interweb followed and the general feeling is that the manifold at the front of the engine is Bank 2. This suggests that some of the fault code listings online are incorrect - look at this example from http://www.troublecodes.net/Lexus/ and you will see that the format leads you to expect a P1155 to be Sensor 1 Bank 2 anyway, and not Bank 1 as shown. So, in summary, I believe P1155 to mean heater circuit problem on O2 sensor 1 Bank 2. Can anyone verify this 100%?? My next little test was to plug that sensor back in and reset the fault codes. Pretty soon my original P1135 code only came back as you might expect. Next sensor I found (which I guess is an O2 sensor) was after what I believe to be the cat and before the centre box. It as a little shield bolted on to protect the forward side of it and the cable goes up through a grommet in the floorpan underneath the passenger seat. Removed said seat to allow me enough room to lift the carpet a little and unplug the sensor. Started car and read the codes a number of times, but no new codes were returned, only the original P1135. So thought that was it and had found the dodgy sensor. Then I got thinking and wondered whether this really was Bank 1 Sensor 1 as other reports told me that Bank 1 Sensor 1 was located on the manifold on the back of the engine and not in the location I was looking at. So, I tested the resistance on the what I believe to be the heater circuit on each of the sensors I had found by testing across the black wires. The one at the front of the manifold returned 1.4 ohms and the other one 14.2 ohms. This tells me that one of them isn't right (you would sensibly expect them to be the same if they were both good) which again points towards the second one I found being bad. I did manage to locate another sensor in the manifold on the back of the engine, but was unable to get access to unplug it and therefore test further. General internet opinion leads me to believe that this is Bank 1 Sensor 1 and therefore the one I need to replace, but that doesn't explain what I saw when playing around with the sensor under the passenger seat! So, what I'm looking for is someone who can confidently and categorically tell me which sensor is which. Is there anyone out there?!? Please? Laters...

Don't know for sure but would have thought there'd be a gasket in the joint. If there is, and it's the gasket that's gone, then it shouldn't be too painful. Someone like Kwik Fit should be able to advise of you don't want to ask a main dealer...

Top man! Thanks loads for confirming... Just need to be sure of location now and I can go ahead and get it sorted. Am reaaaaaaalllly annoyed that the VSC light comes on aswell as the CEL when there's nothing wrong with the VSC - been driving it like I was on ice since in case it was unstable, and now know that this isn't the case. Cheers again. Adam.

As promised, am posting back with results... In short, it works and was dead easy to install and use. Coupla drivers need to be installed on the laptop first (these are supplied with instructions), and then the scantools.net software. Plugged the interface into the car, started the engine, started scantools, waited a short while while comms were established and then clicked 'Read Codes'. Within a few seconds, the fault code (which happened to be P1135 - see here ) was returned. Just needed to look up the meaning on www.troublecodes.net (an example - there are others too) as the code is a manufacturer specific code. I believe that scantools will interpret generic codes for you instead. Note that some of the other options in scantools didn't seem to be functional, so you may need to use another application if you want to use these - I think there are a quite a few available - indeed there are some others supplied. Note that the software and drivers are supplied on 3" CDs which may not be suitable for slot loading CD drives. So, should any other LOC members need codes read, and they can get to me in Billericay, Essex, I'd be happy to do the honours - could save you a few quid. Just let me know. Going to try it out on Mrs sh's Smart next!!

Hi Guys, Just got my shiny new OBD2 interface and it's telling me my RX has a P1135 too. www.troublecodes.net tells me that means "Air/Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)" www.obd-codes.com agrees with this But this place http://www.2carpros.com/kpages/diagnostic_trouble_codes.htm tells me it means "O2 Sensor Heater Circuit Low Voltage (Bank 1 Sensor 1)" So, have trawled the web to try to undersand if an Air/Fuel Ratio sensor is the same thing as an O2 sensor, and i'm getting mixed results. Does anyone here know for sure? And if they do, can they tell me where to find it, please? Cheers, adam.sh

Hi mate i been looking to get one too, your link does not have a Lexus Listed??? You're right there. However, OBD2 with the ELM323 chipset seems to be pretty standard as far as I can make out, plus there's loads of Toyotas listed. And let's face it, my RX is just a posh Toyota!! It's the Beamers and VWs/Audis that seem to be out there on their own and so need something special. Will post back once I've got the thing and got it working. Cheers...

And I've just ordered one of these in the hope that I'll be able to pull the fault codes from my RX... http://www.talktomycar.co.uk/Shop/OBD2_Interfaces/mj028a.htm Didn't go for the ELM327 version as beleive that my 2000 RX doesn't use the CAN protocol anyway, so am hoping this cheaper version should do the trick. Will post back leter in the week to advise how I get on. Cheers...

And I've just ordered one of these in the hope that I'll be able to pull the fault codes from my RX... http://www.talktomycar.co.uk/Shop/OBD2_Interfaces/mj028a.htm Didn't go for the ELM327 version as beleive that my 2000 RX doesn't use the CAN protocol anyway, so am hoping this cheaper version should do the trick. Will post back leter in the week to advise how I get on. Cheers...

My 2000 RX300 did exactly the same thing yesterday! Do you also have the malfunction symbol on the dash? (Looks like an engine). Did you get the fault code read yet? I was looking at buying an ODB2 interface for my PC to avoid paying dealer fees to get the fault code, but if you have it already... ;-) Cheers, A.