I posted pictures on the location and replacement of an ambient temp. sensor for a 2001 S40. Google "ambient temperature sensor location/replacement" or go to Matthew's Volvo site and search there.
Thermostat and thermostat sensor (ect) bad
Which Tires for volvo S40?
It's on the fuel pump inside the fuel tank
Next to the thermostat. you will see it when you remove the hose
Where is the radiator cap on a 2001 Volvo s40?
I'm not sure what you're asking, but if you mean that you are getting an OBD-II diagnostic code of P0128 from your Volvo S40, that code corresponds to a problem with coolant temperature. On a first generation Volvo s40 (99-04), this usually means that the thermostat or electronic coolant temperature sensor are malfuctioning or have failed.
How do i remove the washer bottle from a volvo s40
How do i remove the washer bottle from a Volvo s40
Trouble code P1014 means: CMP Sensor/CKP Sensor Signals Not Compatible
To change the gear position sensor on a Volvo S40, first, ensure the vehicle is securely parked and the ignition is off. Locate the sensor, typically found near the transmission, and disconnect the electrical connector. Remove the mounting bolts securing the sensor, then replace it with the new sensor and reattach the bolts and connector. Finally, test the vehicle to ensure proper operation of the sensor.
To replace the map sensor on a 2003 Volvo S40, first, locate the sensor, which is typically found on the intake manifold. Disconnect the electrical connector and remove the screws securing the sensor. Replace it with a new sensor, ensuring it is properly seated, then reconnect the electrical connector. Finally, start the engine to check for proper operation and any error codes.