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Im getting a P0451 and P0456 code. P0451 and P0456 Yes, I…

Im getting a P0451...

Im getting a P0451 and P0456 code

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

P0451 and P0456 Yes, I have cleared them and they come back on in a few days

Mechanic's Assistant: What is the model/year of your Saab?

2006 93 Aero V6

Mechanic's Assistant: Are you fixing your 9-3 yourself? What have you tried so far?

Yes, I'm repairing myself

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Nothing yet, just trying to se where exactly I should start

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Answered in 4 hours by:
1/16/2018
sprinkles08
sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 24,077
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

P0451 is for the evaporative emissions system's fuel tank pressure sensor. P0456 is a small leak in the evap system.

You may have two separate problems or there may just be one. The pressure sensor code is a performance type code and could be set by a failure of the sensor, a problem with it's wiring, or there may actually be a tank pressure issue. There could be an actual leak in the system. It's also possible that the P0456 is setting because of a bad pressure sensor.

What will need to be done is first use an evaporative emissions system leak detector machine to see if there is actually a leak. If so then it should be repaired and see if the pressure sensor code is repaired. If not, or there are no actual leaks, then odds are the sensor is going to need to be replaced.

My goal is to give you the best experience possible! I hope I have earned a 5 star rating! Please remember to rate my service by selecting the 5 stars at the top of the screen before you leave today. If you need more assistance, please use the reply box and let me know.

sprinkles08
sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 24,077
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified
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