488 Cat sensor failure? Engine management failure?

Well, after 12 months of problem free ownership I have my first issue. And of course this is after a $7K maintenance changing every damn fluid the car has (and headliner for those doing math)

I was on my home track yesterday at The Motor Enclave Tampa. For those of you not familiar it's one of those garage owner tracks where you build a man cave and store cars there and build out your unit and have track access, pool, off road course blah blah well it's not a demanding track, in fact it's more a fundamentals track. You aren't out there beating your car to death. It has a nice flow.

Ambient temps were actually nice yesterday and humidity was way down, it was a pleasant day for FL weather in August, all of us were talking about how nice it was.

So anyway, I did two moderate sessions with 40 min cool downs in-between taking my father and some friends out for their first time. So, I wasn't going 10/10th's and thats probably the 6-7th time that car has been out there and it's been problem free.

After the cooldown lap I pit like normal, popped the hatch and let the car idle for a couple minutes and then shutdown. It sat for 30+ minutes, and although I should have parked in the shade, I didn't think much of the sunlight beating down on it.

On my 3rd and last session I pulled off the starting line onto the track and gave it the beans quicker than I normally would. I usually let the VDA system sensors read everything for the first 1/4 mile, go green, and then give it the full throttle but I jumped into it as the car was already up to temp and didn't think much of it. Well...right after I did the dash lit up with the cat warning and then I cleared that (ok button) and the ECS failure followed it. It went into limp mode I assume because I lost power down to like 50% and I went around and pit the car.

I let it sit for a while and started again hoping it was a fluke, nope. Now it's parked at the track and I'll be calling Ferrari Monday to come pick it up.

A quick call to my indy and he thinks it's a bad sensor that failed or the battery but I keep it on a charger (the new style, not a tender) and I've never had an issue with this cars electrical system. I did some googling and found a bunch of things it could be, like an overfilled oil situation where the sensors get messed up and need to be cleaned, that would piss me off considering what I just paid for service so I hoping it's just the battery or a sensor that melted? I dunno.

Have any of you experienced these warnings and symptoms? Any insight? I'm open to all consideration while she goes through the two week process of a dealer trying to pin the issue and parts swap whilst raping my wallet for fun.

Adam



Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login

 

Here's what Chat GPT had to say btw.



Likely Causes (Ranked by Probability)

1. Cat Temp Sensor or O2 Sensor Failure (Heat-Soak Related)
   • Common on mid-engine cars after shutdown in sunlight: the radiant heat spikes temps around the exhaust.
     
     
   • A failed/weak sensor will read “out of spec” and trigger both cat and ECS warnings.
     
     
   • Ferrari dealers often see this on 458/488 after spirited use.
2. Battery / Voltage Drop Under Load
   • Even if kept on a charger, Ferrari batteries degrade quickly. A weak cell or sudden drop under load can confuse ECUs and cause cascading warnings.
     
     
   • First thing most dealers do is load test the battery, because low voltage = Ferrari gremlins.
3. Overfilled Oil (Sensor Contamination)
   • If oil level is a touch high, crankcase vapors/oil can foul sensors. This can throw off readings (especially wideband O2s). If your indy mentioned it, worth checking.
     
     
   • Not super common, but possible right after a “change every fluid” service.
4. Wiring / Connector Issue Near Cats
   • Heat cycling can cause brittle harness plugs near cats to fail. A loose or melted connector could cause intermittent cat temp faults.
   
   
   Based on what you described (ambient temps fine, only flared after shutdown + restart, cat + ECS together, limp mode immediately), my first bet is a failed cat temp sensor due to heat soak. Second bet: battery sag under load.
   
   

 

Can any OBD2 reader read the ECU, notate the codes, reset and then try or is this a Ferrari dealer only thing?

 

The more I replay the day in my head the more I think the sensor just got heat soaked while my car sat between sessions (no fans blowing onto engine compartment) and when I pushed it immediately on session 3 the temps it saw were outside of normal operating conditions and started a chain reaction for the car to protect it self and go into limp mode. And without a scan tool or battery hard reset, it's stuck in that condition until I can clear the code. Thoughts?

 

Copy that. I just ordered this https://amzn.to/4nc7Ogf

today so I'll go back tomorrow and see what I can do. I'll report back with findings for future reference for any other members that have this issue arise.

 

UPDATE:

Plugged in a reader and got a Cylinder 6 misfire fault code
P0306.

I cleared it and all of them disappeared save for the code marked permanent so I'm assuming Ferrari has to clear that one with their computer.

I cleared it, went on a drive, VDA calibrated, everything fine, I go to accelerate past 50% throttle and it happened again. So, looks like she has to be towed gents.

From the information I have it's either the plugs, coil pack on #6, the battery, or a melted O2 sensor or temp probe. Either way I'm sire it'll be $2K plus. Awesome

*Live data logging showed the battery voltage was fine (14+)
Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login

 

Update: Ordered plugs and a coil from Scuderia Parts. Gonna tackle this myself. It's too easy of a job. I'll let you know if it fixes it!

 

You can just add the car make and model. It says in the manual it doesn't need that info though. Can you do me a favor and see if your live data log screen shows your first 02 sensor reading? Mine is only showing the second one. And I'm not sure if it's a dead sensor or just the app doesn't see it.

 

UPDATE!

Got my hands dirty today but she's back up and running! Smooth as silk!

The coil was fine (changed it anyway) but the spark plug had broken inside the insulator, hence, no spark and a code for CYL6.

I swapped in a new spark plug and coil and gave her a solid test drive. Ran smooth and no codes! The color on the old plugs was perfect too so the engine is running how it should prior to the fault/broken plug.

Thanks for the help fellas!
Image Unavailable, Please Login Image Unavailable, Please Login