V70GLT: How Long b4 OBD monitors ok if...

Old 09-06-2018, 04:48 PM
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Join Date: Sep 2018
Posts: 5
Question V70GLT: How Long b4 OBD monitors ok if...

Hi gents.
I am asking a slightly different question from the one here: https://volvoforums.com/forum/1998-2...onitors-97677/

If one of you who owns a 1998 V70 GLT were to disconnect its battery, all OBD settings would reset to nil and you'd need to drive it some miles before all monitors once again read OK (instead of inc). How many miles would you need to drive your V70 to achieve that?

This is the current state of my OBD State monitor reading:

I'm running out of time as I am leaving for a month in 7 days. The car needs a smog check before the end of September and its inheritor doesn't want the headache. So I fear this well-functioning 1998 V70 GLT will wind up at the dump if I don't buy it.

Please, if one of you owns, or knows someone with this model who themselves has had the problem with the OBD monitors resetting (or is natively helpful and curious and could run an experiment), that could save this car and my conscience.

Thank you.
Old 09-08-2018, 03:45 PM
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 4,800

Here's a relearn cycle I found in another post:

Part of all new car certification requires that the Readiness
Code monitors run to completion after following a standard
specified driving cycle. The drive cycle represented below, is
similar to this standard. You may find it necessary to drive
this complete cycle twice. An adequate cool down period
between the two separate driving cycles – generally 30
minutes – will assure that the various readiness monitors are
reset for the second driving cycle.

1.) Accelerate 0-50 MPH within 30 seconds
2.) Maintain 45-50 MPH for 20 minutes without using cruise control
3.) Park car turn of A/C idle for 5 minutes
4.) Accelerate 0-50 MPH within 30 seconds
5.) Maintain 45-50 MPH for 20 minutes without using cruise control
6.) Shut off car and allow to cool for 30 minutes before repeating cycle ( in some cases the car requires two cycles)
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