F430 CEL

[ck888]

Hi Guys,
Would anyone know if i have an exhaust leak after the precat o2 Sensor but before the post Cat O2 sensor, would this cause a CEL ? i have slight leak where the exhaust manifold joins onto the exhaust (an after market manifold has been fitted for a while now)

I have the code stating a lean mixture and im suspecting a leak at the head manifold joint

Any info / advice would be appreciated

thanks

[oharedm]

I would post this query to
https://www.clubscuderia.co.uk/forum/

[mwstewart]

I assume that the aftermarket manifolds do not have pre-cats, in which case that is the likely cause. My 06 car was less sensitive in that regard than my 08; as time went on Ferrari reduced the calibrated warning threshold.

Sometimes leaks do cause these issues due to reversion i.e. fresh air can be sucking in, but it's much more likely to be the lack of pre-cats - if they have been removed.

[Cerberaherts]

You more than likely need the secondary 02 sensors disabling, but a smoke test will prove/disprove a leak. There are a couple of suppliers of aftermarket manifolds that sell some right old dross, usually the mating flange is distorted and causes a leak at the head, hence a C.E.L…

[mrpseudonym]

What is the CEL code? P2096? If so check that the O2 sensors are not loose…

[ck888]

Hi,
Thanks for all the above, I will do a few more checks. I cannot see anything obvious after inspection of the manifold gaskets. Could it be a faulty o2 sensor ?
I know that the new manifolds may throw the occasional CEL, I can live with that but I want the engine running as it should ie not lean or rich

[Cerberaherts]

It’ll be the secondary sensors if it’s an occasional CEL, and they aren’t responsible for fuelling at all, they just report cat efficiency back to the ECU.

[ck888]

Thanks Guys. I have now fitted the O2 extenders in the post CATS. The readings on the OBD App are showing now showing a much smoother graph on the post sensors and surprisingly the SHort term fuels stats look better on the pre cat O2 sensors too.
Time will tell if the CEL comes back on

[ck888]

So the CEL is back on after 2 resets ( isolate battery for 20 mins or more)


Code P2196 stuck bank 1 rich sensor.

But fuel trims look ok. Does anyone know the threshold values of the trims to initiate a CEL

And is the car actually running rich ? And therefore not producing optimum power ??

[danny tattersall]

I'm not sure whether this will help or not but I've had a simar problem (albeit on a Lotus 111R) and resolved it by fitting two extenders to each O2 sensor. Installing one extender made resulted in the CEL illuminating intermittently but installing two fixed it permanently. If there isn't sufficient room to install two try a 90 degree extender.

[ck888]

Ok thanks for that, just to clarify when you say 2, are they end on end ?
I have fitted 1 90 degree extender on each bank at the moment.

[RichardCHXX]

I would ask Fabspeed, they are experts on creating CEL's

[mwstewart]

LOL Richard.

Swap the o2 sensors and see if the problem follows.

[danny tattersall]

ck888 said:

Ok thanks for that, just to clarify when you say 2, are they end on end ?
I have fitted 1 90 degree extender on each bank at the moment.

Hi, yes I fitted them end on end.

Regards,

Danny.