youll need either an obd2 scanner in later cars or obd1 on board on the cars computer. obd stands for on board diagnostics. this runs codes for things that computer senses are bad or going bad. take it to autoparts stores for the obd2. best to buy a manual or chiltons / haynes manual to help with repairs.
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
It is under the plastic cowling where the wiper arms are at.
On the rear of the exhaust camshaft; behind distributor cap.
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.
There's no Volvo 850 2000. What you likely saw was a S70.
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 ,
Here's a link that may help. The RPM sensor is also known as a crank position sensor. http://www.volvoclub.org.uk/faq/EngineSensors.html#Crank_Postition_Sensor
The Volvo 850 has two horns in front of the radiator, lift the hood and their they are.
A mechanic advised me that it meant the speed sensor needed replacement, not verified.
There's no 2.0L. Volvo 850 engine. Only 2.3L. & 2.4L. ...