21gg 401 Posted August 9, 2020 Report Share Posted August 9, 2020 Ive got a bank 2 sensor 1 error which appears to be the precat on the firewall side. Ive had a look round but not found anything specific about replacing this sensor. Anyone done this got any advice? I cant see it from above and the bulkhead panel sooms to be to the side of it so dont know if this will help. Cheers Gav Quote Link to post Share on other sites
Bravo73 1,295 Posted August 9, 2020 Report Share Posted August 9, 2020 Obvious question but have you erased the code (multiple times, even)? These sensors are notorious for having the occasional hiccup but actually working fine. Quote Link to post Share on other sites
21gg 401 Posted August 9, 2020 Author Report Share Posted August 9, 2020 Ive done it a couple of times and each time after the 2nd start it comes back on as per the trigger logic. It is giving a reading as i can see it but suspect its fluctuating beyond its limits. Quote Link to post Share on other sites
Bruss 579 Posted August 9, 2020 Report Share Posted August 9, 2020 Also I'm not sure about some of the codes. I have had bank x sensor faults that have been cleared by replacing the maf sensor Quote Link to post Share on other sites
21gg 401 Posted August 9, 2020 Author Report Share Posted August 9, 2020 Yes, the first thing i did was clean the maf and throttle body and their connectors. The b2 s1 sensor looks like it may be a bugger to change, hence why I'm aaking advice but happy to try all the easy thing first! Cheers Quote Link to post Share on other sites
21gg 401 Posted August 9, 2020 Author Report Share Posted August 9, 2020 Just looked up the cost of a new maf, ouch. May need to check the denso part number. Quote Link to post Share on other sites
Bruss 579 Posted August 9, 2020 Report Share Posted August 9, 2020 Toyota part iirc. 1 Quote Link to post Share on other sites
agentdr8 148 Posted August 9, 2020 Report Share Posted August 9, 2020 The B2 pre-cat sensor can be easily changed from the top, as long as you have an O2 sensor socket handy. It helps to stand/crouch in the boot and sort of lay across the motor. 1 Quote Link to post Share on other sites
21gg 401 Posted August 18, 2020 Author Report Share Posted August 18, 2020 For future reference, yes its quite easy and straight forward. You have to remove the heat shield from between the engine and bulkhead, this is straight forward but one nut is captive the other is loose so you have to be careful not to drop it. I did this with the engine cold so needed my long bar to crack the sensor loose. One sharp tug to break the seal and it then just undid by hand. New one in and all fitted back. The fault light has cleared, the OBD reader is now clear apart from the catalyst cycle needs time to reset but need a longer drive, the 02 sensor cycle has reset. For reference, I googled the lotus part number which gave a generic Bosch part number and I bought one of those for less than half the price of lotus and I spent £12 on a set of o2 sensor sockets, so all in about £70, a lot less than just the sensor from lotus. 2 Quote Link to post Share on other sites
mg4lotus 136 Posted August 18, 2020 Report Share Posted August 18, 2020 (edited) Hi Gavin I have just recently been getting engine warning light with OBD code P0160 - Bank 2 sensor 2. It has happened after the last two times I have washed the Evora and after it has had time to dry out I have cleared the code and it didn't come back on, so I am guessing it is water in the wiring. Pedal Loud has a Youtube video showing similar For some tips on an alternative method of removing a stubborn sensor see this video The DeRoure link for the sensor is here https://www.deroure.com/partinfo.asp?MAK=1&MDL=20&TBL=12628&SMA=1&SMO=20&ST=sensor&SC=0&PBID=1087696 The Bosch part number is here https://www.onlinecarparts.co.uk/bosch-1149030.html but it can also be found on Ebay for a little as £50 for the genuine Bosch part. I bought two and might do both at the same time. I Haven't done mine yet as it is only throwing the warning after being washed. Edited August 18, 2020 by mg4lotus I'm guessing sensor 2 must be the post cat sensor 1 Quote Link to post Share on other sites
21gg 401 Posted August 18, 2020 Author Report Share Posted August 18, 2020 Yep got mine off ebay! I didnt fancy doing it with hot exhaust or a blow torch as the one I did has very little access room (pre cat between engine and fire wall) and was mainly done by touch. After googling I found the logic behind the fault code, voltage outside limits for a set period, after the second time it triggers. Does sound like yours is either water getting in the connector or the cable has rubbed/melted and the water could be shorting it out. I've got the vag-com/vcds software on my pc which also does obd11, its good as for example, I can see the output from the two sensors on a graph so you can compare them easily. The sensor 2's should be straight forward but much easier with a pit or ramp! Quote Link to post Share on other sites
Hangar 111 302 Posted August 18, 2020 Report Share Posted August 18, 2020 39 minutes ago, mg4lotus said: it can also be found on Ebay for a little as £50 for the genuine Bosch part Oh yes, lots of "genuine" Bosch parts on eBay - use caution! Dave Quote Link to post Share on other sites
mg4lotus 136 Posted August 18, 2020 Report Share Posted August 18, 2020 If you are not confident or unsure of what you are doing then it is always best to use your local Lotus specialist. It will protect service history and value of you Lotus. Quote Link to post Share on other sites
21gg 401 Posted August 18, 2020 Author Report Share Posted August 18, 2020 Yep I realise that cheers, mine 'seems' to be genuine and came overnite from a car spares company so hopefully it is genuine, I could have got a cheaper one but didn't. Its reading alright on the obd graph but will have to see. I have no issue buying genuine parts when needed but neither have I an issue getting non lotus genuine toyota parts like fuel pump, ac compressor etc over the years at much reduced mark up. Everyone has to make a living so no complaints but the ac compressor on my old Evora na saved me £1500. I dont doubt fake parts are a massive problem. Quote Link to post Share on other sites
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