HO2S Heater Control Circuit Low Bank 1 Sensor2
symptoms
Other than the MIL light illuminating you may not notice any performance issues.
cause
A short in the O2 sensor heater circuit or the sensor itself
A faulty O2 sensor heater
Wiring or connectors are broken or frayed to the sensor or relay
Bad PCM or ECM
The fix
Correct wiring short or loose connector found in inspection.
and/or
Replace the bank 1 sensor 2, O2 sensor
Replace PCM if circuit has failed and no wiring issues present, good O2 sensor
What does obd code P0740 mean
Do you mean code P0037? If so:P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
plug a obd 2 code reader into your car and activate it.
OBD I, but for the most part, you can use OBD II
OBD code P0304 is Cylinder Four Misfire.
Obd-on board diagnostic. The port is the plug the scan tool or code reader connects to.
OBD I code 67 - Neutral Drive Switch Circuit Open ( key on , engine off )
J1850 is not a trouble code. It is a protocol that the OBD-II system uses. Trouble codes will be represented by a P before the numbers
OBD code P1127 mean Exhaust not warm enough.
Cylinder #1 misfire.
What does a code 212 mean on a OBD 1 mustang
OBD-1. 1995 was a changeover year. All 1995 cars/trucks (GM to my knowledge, I don't know about the other brands) were OBD-1 and some have an OBD-2 connector, but still are OBD-1.