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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 04-22-2015, 04:44 PM
emptypocketsbmw emptypocketsbmw is offline
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Mein Auto: 98 528i
Help!!!

P1423
p1421
p0420
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  #2  
Old 04-22-2015, 04:47 PM
Edge540 Edge540 is offline
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Mein Auto: 01 540i
P0430
p0455
p0101
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  #3  
Old 04-22-2015, 04:56 PM
edjack edjack is offline
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P1421, 1423 are for the secondary air system.

http://www.obd-codes.com/p0420
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  #4  
Old 04-23-2015, 05:11 AM
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Fudman Fudman is offline
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If the pump activates on cold start, check the SAP vacuum line. This causes the SAP valve to open.
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  #5  
Old 04-23-2015, 06:39 AM
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johnstern johnstern is offline
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Basic SAS diagnostic. *This will not completely diagnose difficult SAS problems, but it will tell you what has failed. *This must be done at cold start, probably after the car has been sitting all night.

Disconnect the large hose (from the SAP-Supplimental Air Pump) and the small vacuum hose (from the electric vacuum solenoid valve) from the SAS check valve. *This can be done the night before. *You need to squeeze hard on the ribbed parts of the plastic ring at the quick disconnect fitting of the large plastic hose and wiggle it off. *The vac hose just pulls off but if it had been in place for a long time you may need to grab it with a pair of pliers and gently twist it a bit to break it loose. *Then pull it off (this hose can be very dried out and need replacement).
*
Now start the engine and run around to the right (passenger) side of the engine compartment and observe what's happening.

If you hear exhaust noises from the check valve, it is stuck open & needs replacement and/or cleaning. *Cleaning may or may not work. *

Now feel for a vacuum (sucking) at the disconnected vac hose. *If no vacuum, you have a problem with the hoses or the electric vacuum valve. *If you feel a vacuum, plug the hose into the check valve. *It should open and when it does you will hear exhaust noises from it. *If no exhaust noises, the check valve is stuck closed and needs replacement or cleaning-see above.

All this time there should be a very strong flow of air from the big plastic hose. *If not, the pump is not running and needs diagnosis.

Please remember that the SAS System only runs for about a minute after startup so you will have to be quick with your inspections. *If the System shuts down before you are finished, you will have to let the engine completely cool be fore you can proceed.*

If you find that the SAS check valve is malfunctioning, you can replace or clean it, your choice. *If the air pump or the vacuum is not working, they will need further diagnosis-see CN90's (CNN) complete write up on the SAS System.

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  #6  
Old 04-23-2015, 07:14 AM
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bluebee bluebee is offline
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[QUOTE=johnstern;9040623]see CN90's (CNN) complete write up on the SAS System.QUOTE]

If the OP can type /sap f3 or /sas f3 in the bestlinks, they can find anything ...

- How the secondary air system (SAS) and secondary air pump (SAP) and air valve, check valve, & electrical valve operate (1) & how to maintain (1) (2) (3) & replace (1) & troubleshoot the BMW E39 SAS SAP valve secondary air pump system (1) (2) (3) (4)

For example ... here is cn90's DIY
5 Series DIY > DIY: 1998 528i S.A.S Pierburg Air Pump Maintenance and Rebuild Info

And here's another from cn90:
> E39 (1997 - 2003) > DIY: Troubleshooting S.A.S. and How to Replace the Famous Fuse # 107!
Quote:
Originally Posted by 540iman View Post
Disconnect your pump and check the voltage at the connector. You will need to allow car to sit for several hours to cool. The SAP will run regardless of temp as it pumps air into the exhaust stream leaning it out as the car was showing that it was exceeding emissions tests in USA for the first minute or so running too rich. You will need to pull the RF wheel and disconnect the front wheel inner panel to get at the pump. Set up your meter so it is ready to go and have someone start your car so you need not run fast and verify that pump is getting voltage. you should read either 12 VDC or negative 12 VDC if your test leads are backwards. If your pump is getting voltage but not turning I will be a little surprised as a frozen motor will often blow the 50 amp fuse. If you have a 12 VDC power supply or battery and a charger, you can remove the three screws and the hose and test it on the bench. If your fuse is blown, disconnect battery and pull passenger seat. There is a fine stainless steel wire which send a signal as to whether the seat is forward or back and sends this signal to the air bag system. Carefully remove the wire and then remove 4 rail bolts which hold the seat to the floor pan. You can just slide the seat rearward and put in back seat foot area. Then you must remove the carpet sill plate to free-up the carpet and then get the carpet out of the way. You will find a stiff 1" thick hard piece of insulation. I cracked mine removing it. The SAP fuse is inside a fuse box and is the farthest left fuse. remove fuse and check it. If it tests good then you are likely dealing with a bad relay. Should be a heavy gauge red wire going to relay coil. See if you have voltage there. If you do, then replace the relay. They are only about $15 bucks. Let me know if you need help. You can take pump apart (water will likely pour out) and see if you can free up motor. to spin easily. I'll subscribe to this thread as I have been through all this myself.

Bill
PS: I added your diagnostic procedure to one of those threads above, so others can find it more easily.
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 04-23-2015 at 07:24 AM.
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  #7  
Old 04-23-2015, 07:15 AM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by Fudman View Post
If the pump activates on cold start, check the SAP vacuum line. This causes the SAP valve to open.
The bestlinks also had Fudman's DIY ...
> E39 (1997 - 2003) > 3d Secondary Air Pump failure in 4 years!

Quote:
Originally Posted by Fudman View Post
My secondary air pump saga continues.

Valve works and hoses are fine. I have checked the circuit and there is electricity at the pump connector. Consequently, I have a bad air pump (again!). I did a check of my repair records and the air pump and valve has been replaced previously under warranty. That means this is the third secondary air pump failure in four years! Seems like a trend. I have reordered a new pump but wonder if I am doomed to replace my pump on an annual basis.

Inspection of the defective air pump reveals no water inside. Hence, the valve is not the culprit. I suspect the cause may be electrically related. Are there any other potential causes of an air pump failure? Could a bad relay be the problem? What causes the air pump to shut off? If it fails to shut off, could I be getting a pump burnout?

Just wondering if any other people with repeated air pump failures have any insight into the cause.
NOTE to self: I probably should consolidate the links, but, clicking isn't any big deal, so, maybe not. It's up to the OP to be able to read...
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #8  
Old 04-23-2015, 07:24 AM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by bluebee View Post
I probably should consolidate the links, but, clicking isn't any big deal, so, maybe not. It's up to the OP to be able to read...
If we consolidated the SAP troubleshooting links, which would be best to reference as the canonical thread to update periodically?
  1. cn90's DIY
  2. Fudmans DIY
  3. cn90's DIY
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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