Ford Fiesta 2003 check engine light and codes P0030 + P0646 + P0693

Question

Hi all,

about a week ago the check engine light on my ford fiest came on. It's basically on solid (not flashing).
bought an OBD adapter and run a scan, got the following codes:
- P0030 Ho2S heater control circuit
- P0646 A/C clutch relay circuit
- P0693 Cooling fan 2 relay control circuit

The car runs fine, no heating, coolant and oil levels are good...

I've got two questions:
1- can I keep driving? or am I going to wreck my engine?
2- what could be the cause? it all seems to be linked to the powertrain... What should I check to try and diagnose?

thanks in advance for any helpful replies!

Vince

Answer 1

P0030 H02S heater control circuit Bank 1 Sensor 1

P0646 Climate control system

P0693 Cooling fan 2 relay control circuit low

When you turn the A/C on this in turn, turns the cooling fan on to keep the condenser cool so the A/C can do its work. P0030 is the 02 sensor , the heater control maintains the temperature needed for the 02 sensor to work. When the CK ENG LT comes on it it means you are no longer at fuel control, the engine management Is no longer in control and as a result you would use more fuel than required,  The CK ENG LT sole purpose is to protect the catalytic convertor and the catalytic convertor is used to protect the environment from harmful emission emitted into the environment. For P0030 check the fuses replace any that is found open.