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Reset Your Volvo’s Computer = Big Difference

How to do the reset? By simply starving the car’s ECU of electricity.

How to Zero out Your Volvo’s Computer and Make it Re-Learn your Driving Style

Since all 1990s and 2000s Volvos’ ECU’s have volatile memory and rely on a constant supply of 12 volts DC from the car, disconnecting the battery will do it. Follow the link below for more on this procedure.

“When my MAF sensor went bad, I changed the sensor and the car ran afterwards – but it was reaaaallllyyyy slow until the turbo picked up, and I noticed black smoke out the back. Once I reset the computer, it instantly had its pep back.”

MVS Forums Contributor northernlights:

The 628 was allegedly stock for the 1995 T5-R, 1996 850R and 1997 850R. I have a list of part numbers for the T5-R ECU’s, and one of the 850R ECU’s, all from the EGR delete attachment (which is interesting in itself!)

These are the numbers I have:

1995 T5-R
9146962, 8601043, 1275388, 8601113
1996 850R

My 628 ECU is not on this list. It is marked P001270xxx, which is most of the actual part number. My original 94 ECU (an 072) is marked P06842210 which is one of the part numbers listed on the EGR paper, so I tend to believe it is accurate.

Anyone have any other part numbers? Like I said, it sure seems stronger than 18 peak hp. And this was before I adjusted the wastegate to 2.4 psi with my patented tool.

Reset Your Volvo’s ECU


awesome blog thank you for posting this

Kate Walton says:

Hi, I am considering purchasing a 2011 Volvo C70. The Car Fax shows several line items for “computer reprogramming”. Is this an issue or standard for Volvo? 5 in 6 years, 1 before the car even sold, oxygen sensor, than 1/2014, 3/2015, 4/2015 and 1/2016. May also have something to do with time of registration or routine service? Thank you very much for any feedback or guidance on this topic for me!

I need a replacement ECU for my Volvo S80 2004 with serial number 0261204559, 01275781B. I would like to know how to go about replacing the ECU as i learnt replacement ECU’s are sourced by serial numbers. Seen a couple on Ebay but want to know which to buy.


My Volvo over heated since then I can not get the motor to wind over is there any resets that I can do to get it to start the dash instruments work perfectly fine just no ignition at all

Dan Goetz says:

After driving at highway speeds with cruise control on for about one hour the engine shut down,engine still running with no power.I have a engine code reader and it says po607 code,I erase all codes and the engine is back to normal again,should I disconnect the battery to reprogram my ECM or replace computer? 2005 xc90 t6 engine with 215000 miles. Sincerely Dan Goetz

Hi guys, was wondering if someone could help me? My wife left the lights on in the car causing the battery to go flat. After managing to jump start it I found that the trip computer in the dash wasn’t working. It no longer displays anything I.e fuel consumption or average miles etc. is there a way I can get these displays back without having to spend too much? My car is a 2005 volvo s40 diesel.

Electral issue,Volvo S80 2004,loses power to dash,AC and loses acceleration when it is hot ambient temperature outside. Will correct itself by turning off the ignition and restarting. This does not happen all the time never know when it is going to happen.There is no Volvo service center in our area. What causes this?

ted goldberg says:

Not sure how to reset computer , must it be replaced ? Dealer could not pinpoint the problem

ted goldberg says:

disconnected battery on a 2001 V-70 ATSR 5 cyl non turbo and lost all computers trouble codes and cannot get computer to send any codes ,

Would not start below 30 degrees , possible ignition or fuel problem

How do you do it on a V70 2.4T 2001 model? Not sure if disconnecting the battery will do it, or?


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