ECM-250A Long Term Fuel Trim - Upper Limit

BlueRubber · Jun 7th, 2018, 15:37

hey all,

Got this error on my '02 V70 2.4 petrol when checking VIDA:
ECM-250A Long Term Fuel Trim - Upper Limit

I think it's an issue with one of the o2 sensors, I can see their values in Vida but I'm not sure what their values should be.
One of the o2 sensors varies its value when revving the engine, the others seem to stay the same.

Anyone know where I can find what the o2 sensor values should be at idle?

Cheers all!

pierremcalpine · Jun 7th, 2018, 18:17

Not sure but I'm thinking 02 sensor as well. I had a similar code come up 2 months back. "blah, blah, blah fuel trim." Replaced the up stream sensor and all was well. When I pulled the old one, it looked like someone had dipped it in fondue!

Missing Lincs · Jun 7th, 2018, 20:25

This could also be the MAF sensor. If O2 sensors fail altogether (or the heaters) they generate a separate error.

KBB · Jun 8th, 2018, 06:34

check the values in freeze frame data first, don't start chucking parts at the problem before you have some decent data to analyse. There are plenty of forced testing that can confirm or deny a components ability to perform correctly.

BlueRubber · Jun 14th, 2018, 15:28

Quote:

Originally Posted by KBB

check the values in freeze frame data first, don't start chucking parts at the problem before you have some decent data to analyse. There are plenty of forced testing that can confirm or deny a components ability to perform correctly.

Thanks for all the info guys.

How can I confirm if it's the lambda sensor? I can see the value but don't know what they should be showing?

Jun 7th, 2018, 15:37	#1
BlueRubber VOC Member Last Online: Jan 29th, 2023 11:13 Join Date: Jan 2018 Location: Reading, Berks	ECM-250A Long Term Fuel Trim - Upper Limit hey all, Got this error on my '02 V70 2.4 petrol when checking VIDA: ECM-250A Long Term Fuel Trim - Upper Limit I think it's an issue with one of the o2 sensors, I can see their values in Vida but I'm not sure what their values should be. One of the o2 sensors varies its value when revving the engine, the others seem to stay the same. Anyone know where I can find what the o2 sensor values should be at idle? Cheers all!

Jun 7th, 2018, 18:17	#2
pierremcalpine Premier Member Last Online: Jan 3rd, 2024 14:43 Join Date: Feb 2012 Location: Toronto Canada	Not sure but I'm thinking 02 sensor as well. I had a similar code come up 2 months back. "blah, blah, blah fuel trim." Replaced the up stream sensor and all was well. When I pulled the old one, it looked like someone had dipped it in fondue! __________________ 2003 V40 1.9T B4204T4, 197,000miles (sold but alive!), 2004 S60 2.5T, 160,000miles, 2010 V70 3.2, 125,000miles, 2002 V70XC 2.4, 175,000miles Click here for my x40 and V70 P3 repair guides

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Jun 7th, 2018, 20:25	#3
Missing Lincs Premier Member Last Online: Today 09:06 Join Date: Jan 2010 Location: Louth	This could also be the MAF sensor. If O2 sensors fail altogether (or the heaters) they generate a separate error.

Jun 8th, 2018, 06:34	#4
KBB Master Tech Last Online: May 18th, 2020 10:57 Join Date: Dec 2006 Location: On Contract Dubai Automotve Technical Academy	check the values in freeze frame data first, don't start chucking parts at the problem before you have some decent data to analyse. There are plenty of forced testing that can confirm or deny a components ability to perform correctly.

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