Check engine went out and staid out

Is your question about the check engine light itself? Turn the key on but do not crank. Does it come on during the initial key on "lamp test". If so, then the check engine light is good.

Now crank the motor. Does the check engine light go out during cranking? If so, that means the PCM is getting a good CKP signal.

Turn the ignition switch off and back on. Does the check engine light come back on?

Another option is to scan the PCM with an ODB2 scanner. Does the ODB2 scanner say that the MIL is on?

Perhaps an even better option is to use a ODB2 scanner with two way activation. Use the ODB2 scanner to command the MIL to turn on. Does the check engine light come on?

Here's some information on an affordable Windows based ODB2 scanner unit.

ForScan ODB2 scanner w ELM327 USB
https://www.stangnet.com/mustang-forums/resources/forscan-odb2-scanner-w-elm327-usb.57/

Black GT said:

However I plugged in the OBD2 scanner and it had a p0153 code.

Click to expand...

I think the key is understanding the difference between a "pending" DTC code and a "hard" DTC.

If there's a DTC code and the MIL is not on, then the code is a pending code. A pending DTC usually are pending while waiting for multiple drive cycles to pass with the DTC still occurring.

OBTW, any ODB2 scanner will tell you IF the MIL is to be on or not.

>>From Ford manual
P0153 - HO2S Sensor Circuit Slow Response (HO2S-21)
See DTC P0133

P0133 - HO2S Sensor Circuit Slow Response (HO2S-11

• Contaminated HO2S sensor.
• Exhaust leaks.
• Shorted /open wiring.
• Improper fueling.
• MAF sensor.
• Deteriorating HO2S sensor.
• Inlet air leaks.