P0135-Right rear (or just) upstream O2 sensor heater failure
P1684-The battery has been disconnected within the last 50 starts
Trouble code P0135 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 1)
O2 sensor Heater Bank 1 Sensor 1
Trouble code P0135 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 1)
Trouble code P0135 means: HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction Trouble code P1684 means: The battery has been disconnected within the last 50 starts
This is referring to the first Oxygen sensor, located on the exhaust manifold. It either indicates a short in the wiring or the sensor needs to be replaced altogether.
Assuming you mean P0135, that would be O2 sensor heater circuit malfunction (bank 1 sensor 1). If the wiring to bank 1 sensor 1 is not damaged, it is probably a bad bank 1 sensor 1 O2 sensor. Replace it.
Trouble code P0135 means: HO2S Heater Performance Sensor 1
Trouble code P0135 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 1)
it is the ignition coil is the problem replace it p0135 for Volvo not sure about p1081
Trouble code P0135 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 1)
Trouble code P0135 means: O2 Heater Circuit (Bank 1, Sensor 1)
Trouble code P0135 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 1)