General Lambda sensor problem after ECU revision

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General Lambda sensor problem after ECU revision

frostbite

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guys. I have a 2005 1.6 stilo. Couple days ago I had a ecu repair because of LooseConnection Car security, alternator fail. It was intermittent.
After the garage guys connected the ecu and started the car, it consumes tooooo much gas and idles very badly. What do you think. What should I do?

Is it a bad o2 sensor or Ecu not able to read O2 sensor?
 

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I would suggest changing lambdas of position. Put post-cat in pre-cat and check the voltages. That way you would know if its the ECU or the lambda sensor.
Cheapest way i could think of.
 
I hope it's just a lambda.

It could be that the rough ECU pre-repair caused the lambda to fail (if it was allowed to become contaminated), so the new/repaired ECU is now trying to work with a duff sensor.

Swapping the sensors just to see if there's any difference is the zero-cost quick check, if you can do this yourself. Otherwise just stick in a new lambaba sensor and see what happens. They're not tooooo dear, for an NTK (made by NGK) or Marelli one, with the connector block included.

Avoid cheapo' lambda's with no connector, that you have to splice in to your existing connector/wiring unless it's just a temporary measure. The joins have to be perfect and stay perfect (vibration, dirt, heat, moisture all trying to get in there and upset the voltage reading that the ECU reads as the lambda's signal).

If a new/swapped lambo' doesn't do it, it could be the ECU is still not fully on-board abd might need another furtle.

Ralf S.
 
guys. I have a 2005 1.6 stilo. Couple days ago I had a ecu repair because of LooseConnection Car security, alternator fail. It was intermittent.
After the garage guys connected the ecu and started the car, it consumes tooooo much gas and idles very badly. What do you think. What should I do?

Is it a bad o2 sensor or Ecu not able to read O2 sensor?

Hi frostbite,
I have a 2004 1.6 stilo,but the problem is the same. It appears periodically LooseConnection Car security and errors P0230 and P1702.I cleaned and tightened the D4 connector, but then the problems described by you appeared. I cleaned the connectors on the way from the key to the ECU pin of the Fiat code (for me A11) and the car is fine, but I don't know how long.
 
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