lambda sensors

lefty007 · Post by **lefty007** » Wed Jun 05, 2019 9:53 am

i have a z4 on a 55 plate. it failed mot due to emissions. i was told it was the lambda sensors i took it to a local garage where they did a diagnostic test it only picked up two sensors and said they were ok. i am now told there are four sensors how do i know which one is at fault.

Mr Tidy · Post by **Mr Tidy** » Wed Jun 05, 2019 9:14 pm

Hi and welcome by the way.

I would try to find a BMW Specialist as they will be more familiar with Z4s, and may have more specific diagnostic equipment - plus it will be much cheaper than using a main dealer!

If you give an idea of where you are, I'm sure someone will be able to give recommendations.

lefty007 · Post by **lefty007** » Thu Jun 06, 2019 10:35 am

i live in newcastle-upon-tyne thanks

lefty007 · Post by **lefty007** » Thu Jun 06, 2019 2:12 pm

bank1 sensor2 on a z4 2.o roadster any one know where it is situated

lefty007 · Post by **lefty007** » Thu Jun 06, 2019 2:15 pm

i have found it is a bank1 sensor2 lambda but where is it ?

LittleZ4 · Post by **LittleZ4** » Thu Jun 06, 2019 3:44 pm

I really want to say post cat coming off the manifold for cylinders 1-3??
Happy to be corrected

lefty007 · Post by **lefty007** » Fri Jun 07, 2019 11:32 am

it is a 2litre 4 cylinder roadster

rsrider · Post by **rsrider** » Sat Jun 08, 2019 3:12 am

Think you might want to re-read forum rules and put this in the right section as well.

Trav · Post by **Trav** » Sat Jun 08, 2019 4:54 am

viewtopic.php?t=21232

Similar thread I think. Good luck.

LittleZ4 · Post by **LittleZ4** » Sat Jun 08, 2019 8:08 pm

Ah we probably should have asked what engine it was first!!

lefty007 · Post by **lefty007** » Sun Jun 09, 2019 9:44 am

you are right it is post cat sensor £112 plus labour

lefty007 · Post by **lefty007** » Tue Jul 02, 2019 11:13 am

looking for a catalylic converter for z4 e85 2.0l roadster

ph001 · Post by **ph001** » Tue Jul 02, 2019 1:56 pm

lefty007 wrote: ↑Tue Jul 02, 2019 11:13 am looking for a catalylic converter for z4 e85 2.0l roadster

...in which case you are actually asking for an entire exhaust manifold as the cats are built into them.

lefty007 · Post by **lefty007** » Sat Apr 02, 2022 6:52 pm

I have replaced the upstream and downstream lambda sensors now I find there’s a fourth one anyone know what it’s called and what does it do thanks

Nanu · Post by **Nanu** » Sat Apr 02, 2022 8:23 pm

If you need a Indy in the Newcastle area try Plough Motors at Boldon. Have used him several times and has changed my sensors

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