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donp38

Well-Known Member

• Aug 20, 2014

• #1

Hi All.

On my 2005 BMW V8.

I have had the engine check light come on and using the RSW diagnostics it has said.
"O2 sensor circuit bank 2 upstream sensor. last occurrence - maximum signal"

So, I sourced an upstream senor and changed it yesterday.

I changed the offside (drivers side) sensor before the cat.

I did my test drive yesterday and this distance (around 10miles) normally would bring the warning light back on. After the run, no warning light and I was comfortable all was sorted.

Yep, you guessed it. Today within 1 mile engine check light on and RSW shows same fault.

Have I changed the wrong one?

What should I look to do now?

Many thanks for any advise...

 

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Full Member

• Aug 20, 2014

• #2

Are you on LPG??

 

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donp38

Well-Known Member

• Aug 20, 2014

• #3

Petrol only...no LPG

 

v8hotrodboy

Active Member

• Aug 20, 2014

• #4

Air leak or maf?

 

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Full Member

• Aug 20, 2014

• #5

As above, also possible is a split PCV valve....

 

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donp38

Well-Known Member

• Aug 20, 2014

• #6

ok, thanks.
How do I diagnose from here?

 

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donp38

Well-Known Member

• Aug 20, 2014

• #7

ok. I'm onto it.
will clean MAF tomorrow and inspect/take apart and put back together the air inlet pipe and air filter assembly.

thanks.

 

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donp38

Well-Known Member

• Aug 20, 2014

• #8

question.
if it is an air leak or MAF or PCV, why is it always the same O2 sensor going off?

 

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Full Member

• Aug 20, 2014

• #9

donp38 said:

question.
if it is an air leak or MAF or PCV, why is it always the same O2 sensor going off?

Click to expand...

No idea, mine does the same but no check engine light comes on for mine....

You may need to reset the fuel trims...

 

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donp38

Well-Known Member

• Aug 20, 2014

• #10

ok. that will be plan b.
I am on a mission.
done the fluids the other day.. All well, many thanks.

 

rewmer

Well-Known Member

• Aug 21, 2014

• #11

Bank one is the side with the oil filler cap. Sounds like you've change the wrong one.

 

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donp38

Well-Known Member

• Aug 21, 2014

• #12

Ah! what a mistake to make. the simplest of things!!

Changed that one (can just do it past the driveshaft) and all ok after 12mile run.

If this is it, I owe you a pint. Many thanks indeed.

regards

 

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donp38

Well-Known Member

• Aug 25, 2014

• #13

ok. so after a good few more miles, all is fine!

So everyone on the V8,

Bank 1 is the side of the oil filler cap!!

it does help if you change the correct side!!

Many thanks again.

 

rewmer

Well-Known Member

• Aug 25, 2014

• #14

Good news, I love a happy ending.

 

holidaychicken

Well-Known Member

• Aug 25, 2014

• #15

donp38 said:

ok. so after a good few more miles, all is fine!

So everyone on the V8,

Bank 1 is the side of the oil filler cap!!

it does help if you change the correct side!!

Many thanks again.

Click to expand...

any tips on getting them out, i tried to change my downstream bank 2 sensor and its having none of it?

 

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donp38

Well-Known Member

• Aug 26, 2014

• #16

Hi Holiday chicken.

I got the car warm, say 1/4 on the temp' gauge.

Disconnect the cable and use a ring spanner.

Position so a sharp shock with a small lump hammer and all is well.

Make sure your spanner is a good fit...

Best of luck..

 

holidaychicken

Well-Known Member

• Aug 26, 2014

• #17

ok thanks, i bought an o2 sensor socket which should help and its downstream so a bit more room hopefully