Hi all new some advice, engine management light came on, fault was bank 1 oxygen sensor pre cat, low fuel

So I replaced the lambda sensor with a Bosch sensor as recommended, had the light reset, was off for around 30 miles soon as I hit the duel carriageway and started to excelerate on comes the engine management light again, I haven't took it back diognostics yet!

But what the hell could it be now? as I have had the part replaced that was faulty? Any help would be apprisated as I have to drive the car over 700miles on holiday on the 23rd and don't want drive it with light on as I don't know what damage it is doing but need the car!

Thanks guys

Could be anything so you need to get a diagnostic done.

What if it comes up with same code which I think it will, putting it on diognostics tomorrow again, so I post the code then

If it's the same code again you could have wiring issue.

That code doesn't neccesarily mean a lambda probe fault, it just means the probe is not seing what it's expecting (or it's out of parrameters). It could be a fuelling problem, air leak, maf out of tollerance etc. You need someone that can interpret live data or log's from a diagnostic not just plump for components with just a fault code.

HTH.

I agree with nitrovrs, there's a bunch of things that could be at the root of the problem.

You really need to get VCDS on it so you can look in engine measuring blocks & do some live logging.

Edited 8 August, 201411 yr by pauldazzle

Vac pipe under the inlet manifold is probably split, its actually a breather pipe. Had the same fault code with mine, it was easy enough to spot as could hear it sucking air in. Also had a slight misfire and was idling at around 1100 rpm.

I changed all the breather pipes on mine as were all perished. Pita job though!

That's VCDS? "P0171 bank 1 system to lean" is the fault code that came up today the garage that I took it to has said spray the hoses and look for leaks as it seams as if it's an air intake fault somewhere? Does that sound right?

Drove the car today for around 40 miles after the light was reset and the lights just come back

On again it doing my head in now, what's the best way to check for leaks in the hoses/pipes and which ones? Sorry to be a pain guys but it's doing my head in never had engine management problems before...gggrrrrr just want it fixed as I need to drive over 700 miles in it in 2 weeks

Spraying the hoses with brake cleaner while the engine is at idle should show up any leaks.

Have a good listen around the intake manifold for hissing. The S pipe under the inlet manifold is a prime suspect for splitting.

Edited 9 August, 201411 yr by pauldazzle

I just stuck my arm under the inlet and moved all the vac pipes around until I heard the noise get worse. Need to pull all the engine covers off and the panel which the dipstick tube attaches too (carefull not to brake the dipstick tube as I did!) to have a proper look

Thanks guys I'll have a look and let you know what I find

There is a hissing coming from around intake manifold but a friend seems to think that is the injectors running does that sound right or not? Should there be any hissing at all? In the engine bay?

Car is also running crap on idle when you are stopped at the lights, will be checking all the pipes tomorrow for leaks but not sure what pipes to spray as I know some are water pipes so rule of thumb I'm guessing if it's hot it water if not air ?

The hissing noise will be an air leak. Small bore pipes that attach to the bottom of the inlet are what you want to be looking at. Mine broke on holiday as it happens! Bodged it to get home

You spray on the small vacuum/boost pipes. Most of them are braided, but the S pipe under the manifold isn't.

Spray all the pipes around the inlet manifold especially the ones underneath. Probably best with a cold engine. Also remove the engine covers and spray all the pipes you can see. You dont say what car you have but im assuming its a VRS?

The 'S pipe under the manifold or the 'Y' pipe on the right hand side of cam cover prime suspects

It looks like it's the pipe that goes down between the inlet manifold and connects into a double connector further up to the right hand side of the inlet manifold, and goes down under the inlet manifold not sure which one without taking off the inlet manifold so at least I now have a good idea where the proble is :-) thanks for everyone's advise just need to get it fixed now, any ideas how much the hoses will be to replace all the vacuum hose? As this problem has ****ed me right off! :-)

Edited 11 August, 201411 yr by Jimmer2908

You are best off replacing the lot. You can get a silicone pipe which replaces the t pipe and both pipes that connect to it plus another one which then connects to the t piece to the inlet. There is also a plastic elbow you should really replace as well, I didnt on mine and now wish I did as is now leaking a bit.

All bits on ebay, just type in 'vw 1.8 breather' and you will see the parts you need. Will be about 50 quid for the lot....

Its a real fiddly job to do so take your time. No need to take the inlet manifold off though.

You are best off replacing the lot. You can get a silicone pipe which replaces the t pipe and both pipes that connect to it plus another one which then connects to the t piece to the inlet. There is also a plastic elbow you should really replace as well, I didnt on mine and now wish I did as is now leaking a bit.

All bits on ebay, just type in 'vw 1.8 breather' and you will see the parts you need. Will be about 50 quid for the lot....

Its a real fiddly job to do so take your time. No need to take the inlet manifold off though.

thinking of doing the same with mine. BUT mine is a 2.0l AZJ engine (from the Golf I believe). The inlet manifold hangs over the top.

There is a small vacuum tube that goes in under on the left hand side that the mechanic said was lose.

But for the life of me I cannot see where or what it connects to due to the inlet manifold. Goes into the dark abyss!

Has anyone got a picture of this small tube with the manifold off?

 

Maybe this is the culprit as it was initially lose when they did the full service.

The 'S' pipe under the manifold has now been superseeded (at my local Audi stealer at least) with a braided item so don't be fobbed off with an older 'plain rubber' type. Should be around the £20-25 mark for this hose.

Personally i would just go with this common fail pipe first to see if it cures the problem on it's own (likely) then upgrade/replace the others when time/money allows.