Lambda Light Again!!

[nikgallagher]

I recently had the lambda light come on (96 854), because - I thought - that the thermostat needed changing and it had been running rich for a couple of weeks. Changed the thermostat and engine is running at proper temp all the time now, so got the code read (2-3-2) and deleted so the light went out. Happy Nik again. However, this morning approx 50 miles after the light was reset, it came on again!! Any ideas gratefully welcomed, and does anyone know what the code 2-3-2 actually stands for?

[Bracer]

2-3-2 Lambda adjustment; For 1994 and later, adaptive heated oxygen sensor control / long term fuel mixture too weak at idle

Sound like you need check out your fuel and ignition system.

[nikgallagher]

Hmmm. Sounds expensive. Looks like the heated sensor is just an unplug, unscrew and replace job. Would it be worth doing this as a first stab? Have seen from previous posts that the sensor itself is quite expensive though.

[Justin]

232 is long term fuel trim as bracer said, it will 99% of the time be caused by a vacume leak, check the elbow that goes into the left of the manifold, (if yours has one), if not it will be a vac hose sucking or blowing air thats giving the ecu the wrong signals from un metered air, hence causing the fault code because its supplying to much or to little fuel.

Check your hoses

[nikgallagher]

Thanks for the info. I will have a look at all the hoses around the intake manifold. Has always made a whooshing sound on accelerating (during nat asp running) but I thought that was just an auto thing. Just seems strange that it has happened exactly the same time as changing the thermostat.

[siamblue]

Thanks for the info. I will have a look at all the hoses around the intake manifold. Has always made a whooshing sound on accelerating (during nat asp running) but I thought that was just an auto thing. Just seems strange that it has happened exactly the same time as changing the thermostat.

If it happened at the same time it must be in what ever you moved,
Do the 850s have 2 Vacuum elbows like the S/V70s ?

[nikgallagher]

I did change the air filter at the same time as the thermostat. Could the problem be coming from there? Didn't have to disconnect any hoses in either case though.

[Bracer]

See here

[nikgallagher]

Now there's an answer! I bow in the presence of your greatness.

[nikgallagher]

Have just been out to check the vac hoses and sure enough the hose elbow leading in to the manifold has perished and broken away from its mounting.
I can't thank you knowledgable people enough. To have such a wealth of experience on hand must be saving all us pilgrims thousands of pounds each year on head-scratching Volvo garage estimates. Keep up the good work, and another thousand thanks for the pearls of wisdom you have shared with me.

[Bracer]

Your welcome, always glad to help

[Justin]

That will 100% be the cause then mate.

20 minute job, ive done 6 of them now so a dab hand......curved bottle nose pliers, long screwdriver and a scratched had, you will be ok

[Bracer]

That will 100% be the cause then mate.

20 minute job, ive done 6 of them now so a dab hand......curved bottle nose pliers, long screwdriver and a scratched had, you will be ok

You do realise you going to be asked to make that 7 now dont you

[Wobbly Dave]

A bit of elbow grease never did anyone any harm


I'll get my coat

[Bracer]

A bit of elbow grease never did anyone any harm


I'll get my coat

I've never minded greasing myself up to the elbo for someone else

[Mrsmopp]

Where is that pukey smiley!!!!

x

[Wobbly Dave]

Did no-one get my joke about the elbow or was it just not funny





BTW - The idea of Steve getting slimed up for action had me worried too!

[Mrsmopp]

Did no-one get my joke about the elbow or was it just not funny

The latter LOL!!! Just kidding!!

x

[Bracer]

Did no-one get my joke about the elbow or was it just not funny





BTW - The idea of Steve getting slimed up for action had me worried too!

The joke No it just weren't funny

And worried, you should be

[nikgallagher]

Did you have to take the power steering pump off to get access to the clamp on the manifold? Seems quite tucked away, even with curved pliers. Also, where does the other end of the hose go? Thought it would go straight to the ECU but seems to disappear in to the bowels of the engine.