Hummer H3 For the Hummer driver who wants the rugged look and off road capabilities of the Hummer, but in a smaller size and with a more fuel economy friendly engine.

Question about )2 sensors?

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Old Jun 28, 2020 | 09:07 PM
  #11  
bassackwards's Avatar
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i found these markings below the Upstream o2 sensor
 
Old Jun 29, 2020 | 08:36 AM
  #12  
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You have a replacement exhaust manifold (not unusual for the I5 the end up with a cracked exhaust manifold). All 2006s were built with the 3.5L L52.

The replacement is built with an extra bung so that the replacement manifold fits all 2006-2010 I5s trucks, you just plug the extra bung that does not line up with your original O2 sensor wiring.
 
Old Jun 29, 2020 | 02:06 PM
  #13  
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That make sense! Thanks all!
 
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