acer54

Can anyone enlighten me to what the letter "E" means on the MPG screen, it's only just started to happen and was wondering if everything was as it should be?

I bought it off eBay it cost £80 including postage & packing.

It's in for MOT and service next week, will mention the EML codes and have him check for leaks on the induction and exhaust sides and also check the O2 sensors up and downstream of the cats.

I do brim it to be fair, yesterday I had the filler cap off to check the integrity of the seal, I'm using it later today, hopefully the EML light stays off!

I do get the whoosh when removing the cap for filling, I also checked and cleaned it but it looked ok before cleaning. The codes do register as pending first and throw the EML later.

EML light back on, same two codes, P0420 & P0430, time to get it checked - just a little afraid of Lexus prices, not sure of the alternatives, any ideas anyone?

I have this basic code reader (eBay item 122028314392) and it works fine on my RX400h for just reading error codes but I want to see more data like O2 sensor readings etc.

Have bought this Bluetooth OBD2 reader as Techstream is very expensive even for limited use. This is supposed to be able to leave connected without draining battery and with the right software can do most things that Techstream will do. Thoughts anybody?

I bought this Bluetooth OBD2 adapter, it's highly recommended, not the cheapest but you get what you pay for........ You can leave it plugged in and when not in use goes into standby mode so hopefully their will be no drain on the battery! Will report back with findings after I've used it for a while, hopefully it will be all good.

Check engine light came on last night, pulled the codes this morning and they are P0420 & P0430, I have reset the codes and will now monitor for a recurrence of the codes. I have looked at what the codes mean and it's pointing to the catalytic converters bank 1 and bank 2, I've also read that in some cases O2 sensors, MAF or an exhaust leak could also be the cause. Can anybody advise me what is actually going on, I'm dreading having to replace the catalytic converters as they are so expensive, it's in for MOT later this month so if the emissions are high this will also point to inefficient catalytic converters but I'm hoping it's an easier fix.

Thanks for that, it was to the left of the bonnet release.

Where exactly is the OBDII socket to read the error codes on my Lexus RX400h?

eBay item 122552762391 I bought this one for my RX400h and it fits and works perfectly.

My RX400h consistently returns about 30mpg mainly around town with the odd longer trip, I certainly don't drive it for economy!

I have recently changed the battery in one of my RX400h fobs and can confirm there is a small phillips screw at the key blade end of the fob on the underside that has to removed before the fob will split open. I've uploaded the video how to. Lexus_RX400_Remote_Battery_Replacement.mp4

Depends where the sensors were fitted and by whom - they weren't a factory option but were usually fitted by the dealers.

My front sensor switch is where the blank is in the attached photo between the rear door switch and the fuel door open switch.

I think foxy-stoat is referring to the Hybrid battery and the normal battery showing good voltage.........

Are all season tyres a good option for the Winter or should I fit Winter tyres? Which brands are recommended or known to be good on my RX400h?

Does not look like you can switch off the rear sensors but as they only work in reverse it's not too much of a problem, the front ones can be turned off journey by journey so again not a problem, a valuable lesson learned if there is a next time - do not paint the sensors! Thanks for all your input!

It was painted without masking and the sensors were painted, does this mean I need to replace them or can something be done with them?

Done some more research and there is a button next to the rear hatch open button on the dashboard, when pushed and you here a long beep and then release it the front sensors are in fact disabled until you switch off and switch back on later - you just push the button again to disable them for that journey. Apparently the rear sensors can be permanently switched off using a button in the luggage area which I just cannot find, anybody know where this button should be if fitted? This is there to use if you are towing etc. to stop the sensors spuriously alarming.

I recently had my front and rear bumpers painted as there was scruff's on all 4 corners from the previous owner. Since having them painted the sensors are going off all the time, the front ones are coming on when the car in front is about 2 metres away (before painting they worked perfectly). Will painting effect there sensitivity or is it something else? Is there a fuse for these that can be pulled till I get them fixed or can they be disabled or disconnected?