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Air Bag Code 42

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  #1  
Old 02-27-2011, 05:15 PM
67and71_Carl 67and71_Carl is offline
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Air Bag Code 42

I have a 2005 Expedition. I am getting a 42 Airbag Code. Has anyone else encountered that? How did you fix it?
Thanks in advance.
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Old 02-27-2011, 06:43 PM
alloro alloro is offline
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Code 42 is the front impact sensor which is located on the vertical support in front of the radiator. Be sure to disconnect the battery for at least 10 minutes before touching anything to do with the airbag system, or you can deploy the airbags.

The sensor could be bad, or sometimes it just loses ground. In the second case remove the sensor and clean it's mounting area. Then put it all back together, reconnect the battery, and see if the code is gone. If that doesn't solve it then try a new sensor. Once again don't forget to first disconnect the battery for at least 10 minutes.
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Old 02-27-2011, 07:50 PM
projectSHO89 projectSHO89 is offline
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It only takes a minute or less for the SRS system to discharge. There is no need to wait 10 minutes.
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Old 02-27-2011, 07:50 PM
projectSHO89 projectSHO89 is offline
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It only takes a minute or less for the SRS system's backup to discharge. There is no need to wait 10 minutes.
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Old 02-27-2011, 07:50 PM
projectSHO89 projectSHO89 is offline
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duplicate....
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Old 02-28-2011, 01:55 PM
alloro alloro is offline
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Quote:
Originally Posted by projectSHO89 View Post
It only takes a minute or less for the SRS system to discharge. There is no need to wait 10 minutes.
If you think 10 minutes is a long time, then try and figure how much time it's going to take to earn enough to buy new airbags and then the time to replace them. After you add that all up you can easily see how 10 minutes is a 'better safe than sorry' approach.
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Old 02-28-2011, 05:53 PM
projectSHO89 projectSHO89 is offline
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If it took more than a minute to safely discharge the backup power supply in the RCM, Ford wouldn't instruct dealer's technicians and mechanics to wait only one minute. See the WSM.

Sample from the 99 WSM"
Quote:
The RCM includes a backup power supply. This feature provides sufficient backup power to deploy the air bags in the event that the ignition circuit is damaged in a collision before the safing and air bag sensors determine that an air bag deployment is required. The backup power supply will deplete its stored energy approximately one minute after the battery ground cable is disconnected.
and, when replacing one of the airbags,

Quote:
Disconnect the battery ground cable (14301) and wait at least one minute. For additional information, refer to 414-01.
You can wait 10 minutes, an hour, a week, or a year if you want to, but the backup supply discharges within the first minute and there is no increased safety margin by waiting any longer.

'Nuff said.
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Old 02-28-2011, 06:18 PM
Eddie2285 Eddie2285 is offline
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You Dont Have to wait 10 minutes for srs to die down with the battery disconected
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Old 02-28-2011, 06:21 PM
Eddie2285 Eddie2285 is offline
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Nope You do not have to wait that long with the battery disconnected



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Old 03-05-2011, 02:06 PM
67and71_Carl 67and71_Carl is offline
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Thank you to alloro, ProjectSHO89 and Eddie2285. Your advice helped fix the problem. It was the sensor. When I disconnected the sensor and looked into the area where the connector plugs in, one of the sensor pins was still stuck in the connector. It had corroded into two. I went to a dealer and bought a new Sensor. It cost about $70.00. I ran into a mechanic on my way out and he said they fix corroded crash sensors all the time.
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