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post #1 of 8 Old 20th May 2019, 02:55 AM Thread Starter
AlexGSi2000
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Question e39 - 145 Lambda Regulator 2

Hi All,

My first post on this forum - wish it was an introduction thread, instead - I'm asking for help already!

Purchased my 2001 M5 two months ago, it was a dream purchase for me, having had a few e39s prior to this (530d).
The model I bought was from the lower end of the market, given it had a few items needing attention - the first of which being a paddle clutch which needed removing.

My aim is to put right any issues the car has from a mechanical aspect first, then move on to the areas of bodywork that need attention.

On the whole, its a good car, few small issues - nothing serious. I however am impatient, so the past two months have been fairly expensive in terms of parts (I did budget a little extra for immediate repairs).

I have covered around 1500 miles in the car so far, all of which have been trouble free - apart from realising the engine hasn't been running at its full potential.

I changed over the spark plugs yesterday and plugged into INPA - there was a code for 145 - Lambda Regulator 2, I cleared this and it came back immediately - this is the issue I am having at the moment.

After a quick search, most people seem to point the finger at defective MAF sensors, I unplugged them to see how the car performed under the alpha-n condition and it blew me away, the car had never felt so powerful since I bought it.

My initial thoughts were to purchase replacement MAFs, however I feel it may be a false positive and another issue causing the code. Thankfully Jamie lives locally and has a spare set - so aiming to test these over the next few days.

A few things I have tried so far;
- Switched the MAF sensors - no difference.
- Switched the pre-cat lambda sensors - no difference, same 145 code.

What I did notice when I removed the MAFs was that the seal from the bank 2 MAF to the intake pipe was missing but still appeared to be sealed, I switched the seal from bank 1 but still got the same 145 code after clearing (I will order a replacement anyway).

I had the exhaust removed whilst changing the clutch the other month, I replaced the firing rings / gaskets from the downpipe - which appear to be sealed properly.

My plan for tomorrow is to remove the intake plenum to see if there are any splits on the intake gaskets or vac lines, hope I'm not leading myself down the wrong track if it turns out to be the MAFs, but no harm in checking anyway.

Will report back with my findings, but wondered if anyone else has experience with the same code / problem?
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post #2 of 8 Old 20th May 2019, 03:00 AM Thread Starter
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Below are a few screenshots from today;





e39 - 145 Lambda Regulator 2-code1.jpg.0ce29e80ea78c3d659153847c288dc86.jpg




The monitor probe for Cats 1 & 2 did fluctuate every few seconds (at idle);



e39 - 145 Lambda Regulator 2-1375126668_analogvalues.thumb.png.b4c4ec947859b0118c6e6d6ceeec2725.png


e39 - 145 Lambda Regulator 2-rununrest.png.33bf5ef36af6772ce96894b12531ce84.png
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post #3 of 8 Old 20th May 2019, 10:56 AM
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145 does not really have much to do with the O2 sensors. It means that the fuel air mixture is trying to be adjusted to get the O2 sensor to read correctly but that the max adjustment has been made and the trim is still not correct.
Car ran better with the MAFs unplugged, but did it run better when you put Jamie's on? There are probably a few issue that need to be dealt with, nature of old cars.
You likely have an injector not working correctly. The first stab on that with minimal pain to the wallet is to use a bottle of good quality injector cleaner. There are not many injector cleaners that work, but if you find one with PEA in it that is what you need. PEA injector cleaners do work and are the only ones that get all deposits. After you run that tank of gas you would add an upperhead lubricate for a couple reasons. First the PEA cleaner just striped all or anything that could have lubed your injectors. Second the issue you are having may not be crud it could be wear and a lube will help the parts move.
Don't know you may get the same products I use here in the UK. Two cleaners I know that have PEA here in NA are techron and Guaranteed to pass. As for upper head lube Lucas is the only thing I would use.
If either of those things help, they are not fixing the problem just bandaiding it most likely, but it gives you an idea. The other thing is maybe Jamie has a set of injectors kicking around since he may have changed his when he supercharged.


There could be many things that you would have to look at if it was a problem on both banks, but when it is only on one bank that narrows it down.
Say hello to Jamie for me would you.
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post #4 of 8 Old 21st May 2019, 01:42 PM Thread Starter
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Thanks for your explanation - it makes much more sense now.

I spent a little more time on the car yesterday evening.

- checked inlet plenum / gaskets / vac lines. All appear ok.
- checked exhaust for any leaks / sensor bung crack. All appeared ok.

As you mentioned injectors, I thought I would switch them from bank to bank to see if the code moved to bank 1, however they seemed to be held in very well by the seals and ran out of time, so had to piece it back together again.

I didn't end up borrowing the maf's from Jamie as I decided to purchase a new pair I found at a reasonable price.
They arrived today so will try them out later.

If the issue carries on, I think the next port of call will be to set aside some more time and switch the injectors from bank to bank.

If the code moves then I will be sending them away for cleaning / calibration.

As for the fuel cleaner - I couldn't quite stomach the cost of BG44 so have gone for a shot of Millers injector cleaner, combined with a tank of v-power and a drive this weekend - it may help.

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post #5 of 8 Old 21st May 2019, 06:30 PM
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Dude if you are going to nickel and dime the car sell it now, they are money pits and they are hungry. I did a search of the products you named and it does not look like you have done anything. Miller injector cleaner is a standard PBA for diesels. It will do little but might partly lube the upper head. You are wasting your money and time unless you use a PEA product.


Also don't pull injectors from one side and put them in the other, at minimum you pull them clean the outside and install new orings then install them. Since you are doing so much it is just better to send them out for pro testing and cleaning while out.
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post #6 of 8 Old 21st May 2019, 11:56 PM Thread Starter
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Quote:
Originally Posted by Sailor24 View Post
Dude if you are going to nickel and dime the car sell it now, they are money pits and they are hungry. I did a search of the products you named and it does not look like you have done anything. Miller injector cleaner is a standard PBA for diesels. It will do little but might partly lube the upper head. You are wasting your money and time unless you use a PEA product.


Also don't pull injectors from one side and put them in the other, at minimum you pull them clean the outside and install new orings then install them. Since you are doing so much it is just better to send them out for pro testing and cleaning while out.

Please rest assured, I'm not going "nickel and dime", with a parts total of over £1500 in the first month of ownership I would have said it was quite the opposite.
I am fully aware of how much the e39 M5 costs to run, having owned a few e39s in the past. I am purely trying to save any unnecessary cost by trying to pinpoint the issue.


The injector cleaner in question is for petrol cars; PETROL INJECTOR CLEANER | Millers Oils - Advanced Lubricants, Oils and Fuel Additives Millers is quite a reputable brand in the UK.


Anyway, as an update on the issue itself - it appears a pair of new MAFs have solved this.
The lambda integrator for both banks now hovers around 1, where as previously bank 2 was maxed at 1.25.
Have driven around 30 miles this evening and the error code has not returned, lots of lower and mid-range torque has been restored that hasn't been there since I have had the car.


On closer inspection of the old MAFs, they both had different part numbers - one I think may have been a VAG part number, both were also missing one screw that holds the MAF into the housing


Anyway, all is well - thanks again for the advice and suggestions.
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post #7 of 8 Old 22nd May 2019, 06:01 PM
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Did you read your link? There is no mention of the product having PEA in it. Products that have that in it boast about it.


You likely still have a problem in one bank. The MAFs are paired and the plenum shared. Bad Mafs can't do something to one bank and not the other. But if they are just out by some they could lower the whole works, to show a problem that one cyl has the other does not.


BTW many of us have dropped $5000 in the first year on parts and other maintenance items DIY
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post #8 of 8 Old 22nd May 2019, 06:43 PM Thread Starter
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Thanks again. I guess I'm just not the right owner for this car eh!


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