Technical Engine Management Light

[mackett1968]

Hi, after nearly ten months of good running the enginge management light of my 899cc Cinquecento sx has started to come on every so often, particulary on the over run. I don't think it is the head gasket (again) as there is no water loss or mayonaise in the filler cap and the heater is still working Ok on idle! Can any of you Tech Heads suggest what else it could be and give me the order of likelehood for these faults.

Thankyou

mackett1968

 

[randomizered]

could be loads of stuff....lambda sensor seems a particular favorite though

 

[Citizen Smith]

Hi, after nearly ten months of good running the enginge management light of my 899cc Cinquecento sx has started to come on every so often, particulary on the over run.
mackett1968

Sounds like could be map sensor fault, poss also lambda fault.

 

[randomizered]

Best way is to get stored codes read from the ECU though, that should help a lot, but will cost you a bit...almost certainly better than guessing at a few items though

Kristian

 

[AppleSei]

A code read/diagnostic isnt that expensive. 30-40 you are possibly looking at at an independent. IIRC fiat dealers are a bit more in terms of price.

Hopefully fault can be discovered via that method but i would say its a sensor problem as well

 

[rallycinq]

On the over run, then I would be looking at the MAP sensor as you are full vacuum with the throttle closed.

But

As has been suggested, code reading is a good idea.

Cheers

D

 

[frenchwood]

I concur. Sounds like the MAP Sensor, and/or Lambda sensor.

 

[mackett1968]

Thanks for your help, I will get a ECU code test at the local Fiat dealer so I only replace the bit needed!

Thanks again

 

[rallycinq]

Try your local auto electrician. He should have a code reader and be cheaper than Fiat.

Cheers

D