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.
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.
A leaky mass airflow sensor or it can be a leak in the air intake hose.
If your 850 Volvo starts but then cuts out, it could be due to several issues. Common causes include a failing fuel pump, a clogged fuel filter, or problems with the ignition system, such as faulty spark plugs or ignition coils. Additionally, a malfunctioning sensor, such as the mass airflow sensor or crankshaft position sensor, could disrupt the engine's operation. It's advisable to run a diagnostic check to pinpoint the exact issue.
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.