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Hi Randall Starkie,
Are you one in the same that is selling a 1989 240 90,000 miles in Hamilton, Ohio on the Volvo 240 Cars and Parts For Sale & Wanted facespacedbook page?
Though Spook and others can better answer you, I'll guess your 1992 Volvo 740 normally aspirated comes equipped with the Bendix Regina (fuel - OBD box socket 2) and Rex (ignition - OBD socket 6) engine control? Or is it Bosch like that 1989 240 with the LH-Jet 2.4 (socket 2)and the EZK116 (socket 6) ignition?
https://www.ipdusa.com/techtips/10085/how-can-i-tell-if-my-volvo-has-bosch-or-regina-fuel-injection
https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm
And you check both sockets and, with key to dash light on (engine not running) when you insert the probe into either socket 2 and socket 6, you receive a 1-1-1 (all's clear and good)?
As Art has indicated before, and is true sometimes of the Bendix system on 700 I'd futzed with for others, there may be a fault, yet the codes don't show it as the fault condition does not consistently breach what is an out of bounds threshold to set fault codes at the OBD checker, yet at the time the CHECK ENGINE light (not the SERVICE change oil light) is powered on by a or both control units, you may encounter the fault code at the OBD checker.
If a fault code sets on the Bosch, it usually remains until cleared. As for the Bendix Rex / Regina, does it clear the codes if the fault cause is within tolerance or out of bounds?
When your son encounters the CHECK ENGINE light, does it run poorly?
I see nothing here about false-flag CHECK ENGINE lights, specifically. Though mention of dash lights remaining on.
https://www.brickboard.com/FAQ/700-900/ElectricalInstruments.htm
Hope that helps.
Questions?
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