The one in the back of the block is the front. Check if this fits your honda accord. The o2 sensor is underneath.
2007 honda accord 2.4 upstream o2 sensor
Locate the oxygen sensor and wiring harness;
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Web I Understand That There Is Also A O2 Sensor In The Back Of The Engine Block (Between The Engine And The Firewall).
Warm up the engine to obtain an accurate reading.
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