Sorry but i can't find this in the search.
I have yet again taken my car to a garage that i trust and they are still having a problem solving why my engine management light wont go out. They know it is one of the lamda sensors causing the problem, i am not really up on what this all means so if things don't seem right please let me know.
Bought a new sensor from Honda, it was fitted and still came up with the same fault, they reckon it could have caused a problem with the ECU but can't traice it and they say i need the pin data, which they have not been able to find. Also each time they cleared it, it varied between the two of them,(sensors that is!)
I have told them that i am planning on keeping the car for many more years and they have assured me it will not cause any problems, other than slightly over fueling when cold but they also told me, with the new MOT rules coming in soon any warning light on the dash, could end up an MOT failure
Main thing is they need the pin data to sort it!
Any help would much appreciated
Steve Lion@heart and hopefully for many more years

 

To start the line about being no big deal it just overfuels at cold start is nonsense.

The O2 or Lambda sensor is not employed at all in a cold start, they have to be hot to give a correct signal.
The car starts in open loop - the sensor is not in use until hot (switching to closed loop feedback where it controls fuelling)

Take it elsewhere before they ruin something.

Running a poorly fuelling car can ruin the CAT amongst other things, as well as a very poor idle.

Are they sure they had the right sensor, or that the CAT is not actually knackered?

 

The cat could be on it's way out, because it has started rattling a little, would that cause a problem, did have decat with a Garage R exhaust on, then had the cat fitted again for the MOT.
Engine light only came on many months after, with cat on again?

 

How can they 'not find' the pinout data for the ECU

They will have the full service manual.

Sounds like BS to me, I would take it to another dealer.

Edit:

I just re-read you first post and realise that you did not take the car to a Honda dealer. Maybe that would be your best bet.

Chris.

 

The car as far as i can tell runs perfect, no idle probs and no other symptoms!

 

Grease on an O2 sensor can cause problems if to much is used and it contaminates the sensor body.
You will get cat failure error codes form one, and/or fuelling errors.

Which sensor have you replaced, the one before or after the cat?
The one near the engine controls the fuelling, the one after the cat is just checking cat efficiency....

 

 

They told me they can trace most pin data on many cars but haven't managed to find for the S2000

 

As has been said above, take it to someone who knows what they are doing.