While the engine is running I use a scanner to

Question edited for clarity.
Question moved to model category.

This is a strange code that doesn't appear to have one definitive reason, it's a bit of "you have a bit of a problem, but we aren't sure". Just Answer dot com mechanic says it is the MAF Sensor.

https://p1004-volvo.autotroublecode.com/

http://p1004.engine-trouble-code.com/

I have a 99 s70 volvo that has a p1004 code. I've been told

JustAnswer https://www.justanswer.com > volvo > iq32q-99-s70-v...
Feb 12, 2022 - On newer vehicles, the P1004 is for the short runner valve which is internal to the intake manifold and makes sure there is even air ...

1 answer · Top answer: HI This is 100% unrelated to your original question. I will answer this as a courtesy, but ...

Have 1999 Volvo S70 Non-Turbo. Codes are P0420, ...

AutoCodes https://www.autocodes.com > have-1999-volvo-s70-n...
Apr 24, 2017 - Have 1999 Volvo S70 Non-Turbo. Codes are P0420, P0645, P1004, P1081, Symptom= intermittent stall. NO Check engine light on. Seems to accelerate ...

I imagine that you installed the code in the radio after installing it. Check that you picked up the correct power wire (accessory [power )

Did the engine stall or did it just lose power but stay running? Did the gauges fall to "0" or idle?

Usually when something major like that happens, the check engine light will come on and there will be codes set in the computer.

I would start by checking the codes, and if at all possible, use Volvo's VIDA and DiCE interface to make sure you get the right codes. Some generic code readers can't read all the Volvo specific stuff.

That will get you closer to the actual problem.

Rule out the simple stuff. Do you have enough gas in the tank? The gas gauge might be wrong and you're empty. The ETM could be wonky and on its way out. Google "Volvo ETM" and read up - there's a sticker on it and the color of the sticker could indicate if you have the old (likely faulty) module or not.

Ignition wires - these engines are coil on plug if I remember right (they changed around those years '98 or '99) and then you check the little wires to the coils.

Best use OBD II scanner,read the code and fix it.Sometimes to rest helps too.

Hi the 1998 Volvo Have OBD II and require a code reader to to read and erase code which resets the service engine soon light if you go to AutoZone they will reset it for you for free.
Have a good night.

CODE P1618 CABLE FAULT BETWEEN AW 50 Q2 TRANSMISSION CONTROL MODULE.AND MOTRONIC 4.4 ENGINE CONTROL MODULE LAMP LIGHTS.

try disconnecting battery for an hour
are there any codes coming up

Could have broken the timing belt which could have cause some internal engine damage

Something is going on with the transmission control system. You need to find out what codes are stored in the system. Most likely the transmission range switch is failing.

your friend is on the right track, it does sound like it cvould be spark plugs but get the codes read as well, it is very common for coils to go out on those cars which will also give a misfire and lack of power.