2007 petrol 1.4 fiesta, showing P0030 heater control circuit bank 1 sensor 1. After clearing, Logs the fault again immediately you turn the engine on (not with just the ignition on). Same whether engine is hot or cold.
Assuming this is the pre-cat one at the top rear of the engine bay, I’ve unplugged it and get 12V across 2 of the 4 terminals on the supply, when the ignition’s on, and for about 10secs after turning ignition off.
I’m guessing I should replace the lambda sensor, just wondered if there’s anything else I can check/test either with my OBD reader (a very basic one) or on the terminals to be more sure where the fault lies?
If I get a new one I’ll get a half decent one (£80 upwards) rather than a cheapo.
Any advice much appreciated...
Assuming this is the pre-cat one at the top rear of the engine bay, I’ve unplugged it and get 12V across 2 of the 4 terminals on the supply, when the ignition’s on, and for about 10secs after turning ignition off.
I’m guessing I should replace the lambda sensor, just wondered if there’s anything else I can check/test either with my OBD reader (a very basic one) or on the terminals to be more sure where the fault lies?
If I get a new one I’ll get a half decent one (£80 upwards) rather than a cheapo.
Any advice much appreciated...