2001 volvo v70 error code p1604 Cannot drive over 25mph. When the code is cleared runs fine for 20-40 miles then reverts to problem. I found a code match for internal throttle signal but not sure what that means. Is that the throttle body sensor? Thanks for your help

You need a repair shop to drive the vehicle with a professional
scan tool, for at least 25 miles

That way all the Emissions Monitors will run clear

If you fail to do that,your guaranteed to fail inspection

If any codes come back,then the vehicle has to be component
test & repaired

It sounds as though there was some pushing & poking, done by
I assume, a shop & parts changed,tested or in need of replacing,
who knows

You also will have freeze frame data at the time the codes are set,
to help with the diagnoses,IF-- you have a good shop to work on it,
so far that doesn't appear to be the case

I don't buy your hopeful rational --IF-- the oil has not been changed
(often)over the life of the motor,wrong oil used or the cam actuators
have failed,as is sort of where all this conversation has gone or
explained to you

If the cam timing is not correct,then yes, the oxygen sensor codes
may set- BUT- I don't buy the fact they go away & never come back

We could be here a long time,so I suggest you keep your line of
questions going at a repair shop. Their not wrong or far off,you just
need to understand how things work together in a motor or maybe
not play well with other parts under certain conditions

have it reset by a scanner
quicker safer and costs nothi9ng at auto parts shops

Volvo v70 automatic gearbox is very sensitive to the wrong oil. Drain and refill with Mobil ATF3309

Did u try disconnecting your batt for the night Abdul rehook it up in the morning this should clear your fault codes thanx Chris

I have a 2001 volvo v70 wagon. My lower brake lights are not working but my 3rd (top) brake light works fine. I replaced the bulbs checked my brake light relay checked all fuses and ground wire and all seems to be fine, but the lower brake lights still doesn't work. I need Help!

the engine Serial number can be found on the timing belt cover, and also
another one stamped just below the head on the intake side...hope this helps

A full walk-through of your issue may be found here:
http://www.matthewsvolvosite.com/2009/05/replace-window-switches-on-volvo-s70-v70/
Have a nice day!

other than regular service like brakes and oil change you woun't have to do anything.

Either get a OBD2 electronic reader and clear codes or try disconnecting battery for five minutes to reset. Good luck.

once hot it presents this problem?..when fluid pressure is lowest is when it is hottest...can you service transmission with new filter and fluid and be sure all lines up to trans cooler at bottom of radiator are clear?