You can disconect the battery for a minute then reconect or theres a diagnostic conector near the right front of the car. you need to get a manual or check on line for how to read codes and reset
Check and change the relay
To reset the check engine light on a 1994 Volvo 960, you can disconnect the battery by removing the negative terminal for about 10-15 minutes. This will clear the engine codes and turn off the check engine light. Alternatively, you can use an OBD-I scanner to read and clear the codes. Always ensure any underlying issues are addressed before resetting the light.
To reset the check engine light on a 1994 Volvo 960, first, ensure that any underlying issues have been addressed. Then, disconnect the negative terminal of the battery and leave it disconnected for about 15 minutes. Reconnect the battery terminal, and the check engine light should reset. If the light comes back on, further diagnostics may be needed to identify and resolve the issue.
To replace the thermostat housing on a 1994 Volvo 850, first ensure the engine is cool and disconnect the battery. Drain the coolant, then remove the hoses connected to the thermostat housing and unscrew the housing from the engine block. Replace the old housing with a new one, ensuring a proper seal with a new gasket, then reattach the hoses and refill the coolant. Finally, reconnect the battery and start the engine to check for leaks.
Check the bulbs, check the fuse, check the brake light switch, in that order.
The code numbers are two didgit codes. That was probably a 12 and a 55. 12 is start of message, 55 is end of message. Basically that means there are no trouble codes.
The fuel pressure for a 1994 Volvo 940 typically ranges from 36 to 42 psi (pounds per square inch) at the fuel rail. This pressure is essential for proper fuel delivery to the engine. If you're troubleshooting fuel issues, it's important to check the pressure with a reliable gauge to ensure it falls within this range.
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.
In a 1994 Volvo 940, the thermostat is located in the engine's coolant passage, typically near the top of the engine, at the junction where the upper radiator hose connects to the engine block. To access it, you usually need to remove the upper radiator hose and the thermostat housing, which is bolted to the engine. It's important to ensure the engine is cool before attempting to replace the thermostat to avoid burns or injury.
On a 1994 Volvo 960, the timing marks are located on the engine's front. For the inline-six engine, you can find the timing marks on the crankshaft pulley and the timing cover. The marks align to indicate the correct timing for the engine's camshaft and crankshaft. It's essential to ensure that the marks are aligned accurately during timing belt replacement or adjustments to maintain engine performance.
For the 1994, you have to remove the negative battery cable, then depress the brake and hold it in for 5 seconds to reset the check engine light.
Use a code reader to find out why the check engine light is on.