2004 Honda Accord cel code p2251

2004 HONDA ACCORD
124,000 MILES • 6 CYL • FWD • AUTOMATIC
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JOSHFOX04ACCORD
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  • 1 POST
CEL code P2251 Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VS Line High Voltage. There are 4 o2 sensors on this vehicle; 2 in the front and 2 in the rear. With this code which of the o2 sensors needs to be replaced the rear upstream or downstream?
Jul 21, 2010 at 1:18 PM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
Hi Joshfox04accord,

Bank 1 Sensor 1 = rear upstream HO2S sensor.
Jul 24, 2010 at 2:09 AM
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