modulator valve vs. VSG valve replacement

Hi there! I have a 4x4, red, 1999 sheep feeding, 166,000 miles young, awesome truck that has been in 4 x's for check engine light. It first appeared on a year ago & i was told just ignore it. She runs great but it bothers me & am fearful of breaking done. the toyota repair man first replaced the VSV ??valve & charged 440. bucks as he said maybe welding up the holes in muffler would turn sensor off. OK heres 99 bucks for muffler. Nope, then they looked more & was sure it was the VSV valve as it coded? the light was back on 5 miles away from shop. I drove it around farm till last monday, brought it in he said opps sorry just a valve wire was loose, no charge, she good now. Light back on by time reach the farm 8 miles away! In today & they say it needs the modulator valve replaced - needs a good technician to figure this one out & we are cutting the price to $175.00 for part & labor. is this just hooey?
Thank ewe for any ideas as they would have to order part.
michele

 

If its a 2.7 someone on here fixed it by replacing the EGR temp sensor but that may not be your problem. Good luck sorting it out.

 

OK, so i have a failed modulator valve. Should my truck run rough or a lot of fuel - she doesn't. Should i just keep driving her with check engine on as i have for 1+ yrs now? The new VSV sure did nothing for me. What do I benefit for installing $175 of a new modulator valve? What if the check engine light is still on? Is this valve something I can buy at Auto Zone & have my husband install? Or is it sort of complicated to get to?
thank ewe for any suggestions or experiences on these units
sincerely
Michele

 

OK, so i have a failed modulator valve. Should my truck run rough or a lot of fuel - she doesn't. Should i just keep driving her with check engine on as i have for 1+ yrs now? The new VSV sure did nothing for me. What do I benefit for installing $175 of a new modulator valve? What if the check engine light is still on? Is this valve something I can buy at Auto Zone & have my husband install? Or is it sort of complicated to get to?
thank ewe for any suggestions or experiences on these units
sincerely
Michele

 

Looks like the valve is $60-$80 on line but if you're more comfortable letting someone else do it just do it