your rear camshaft seals are old...they are about 15 dollars at your local dealer. replacing them is a pain. like two to three hours worth of work...well I am referencing my 94 85 turbo anyway....
buy the hanes or chilton's repair book and you should be able to do it yourself.
Dealer price? 400 dollars plus mostly labor money...
On the rear of the exhaust camshaft; behind distributor cap.
on the right side of the engine at the back at the righ end of the cam shaft
The 1994 Volvo 850 crankshaft position sensor can be found on the back of the engine. You will need to remove the rear engine cover in order to access the crankshaft position sensor.
The 850 does not use a MAP sensor. It uses a MAF sensor that is located and attached to the air filter housing lid
Ohh my little one.... After two days of on-line searches and two Volvo manuals I learned that there are no crank sensors referred in the manuals. I bought it as a "Crankshaft Position Sensor'' but it`s referred as "RPM Sensor" It`s position is on TOP of the flywheel next to the engine. Directly UNDER the distributor cap and the camshaft sensor cover. I J077535
It is under the plastic cowling where the wiper arms are at.
Fix the problem and the light will go out. Normally on Volvo 850's the ABS sensor goes out (actually a wire comes loose inside the unit) this sensor is under the hood on the ABS unit.
On a 1997 Volvo 850 GLT, the speedometer sensor is located on the transmission. Specifically, it is mounted on the driver's side of the transmission, near the rear, and is often referred to as the vehicle speed sensor (VSS). To access it, you may need to raise the vehicle and remove any obstructions to reach the sensor.
There's no Volvo 850 2000. What you likely saw was a S70.
To replace the camshaft seals on a Volvo 850, first, ensure the engine is cool and disconnect the battery. Remove the timing belt cover and the timing belt to access the camshaft. Carefully pry out the old seals using a seal puller or a flat tool, then clean the sealing surfaces. Install the new seals by lightly greasing them and pressing them into place, reassemble the timing belt, cover, and reconnect the battery.
A leaky mass airflow sensor or it can be a leak in the air intake hose.
when engine running , i took out msf sensor accidentally. Then lambda on ,