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**Jason Banks** · 01-09-2023, 10:19 AM

P0452 you need to tune out to not turn on the CEL/MIL. It would not prevent you from starting. I'm assuming you don't have the whole evaporative emissions system and this is a swap vehicle. Sounds like you don't have HP Tuners? Or have you not had any programming done to the computer?

If you suspect injectors are not firing, you could first check and make sure you have battery positive at all of them. They are negative/ground triggered from the ECU.

If you have battery voltage at all of them, to test the negative trigger, it is easiest to use an "injector noid light".

01-09-2023, 10:19 AM	#7
Jason Banks Senior Member Join Date: Dec 1999 Location: TX Posts: 1,531	Re: Po452 P0452 you need to tune out to not turn on the CEL/MIL. It would not prevent you from starting. I'm assuming you don't have the whole evaporative emissions system and this is a swap vehicle. Sounds like you don't have HP Tuners? Or have you not had any programming done to the computer? If you suspect injectors are not firing, you could first check and make sure you have battery positive at all of them. They are negative/ground triggered from the ECU. If you have battery voltage at all of them, to test the negative trigger, it is easiest to use an "injector noid light".