I'm replacing an O2 sensor, but not sure if my engine is ULEV or not? The item for sale is O2 Sensor Front non-ULEV.

Thanks,

--tj

 

Do you know where to find the engine serial# stamping?

On the block, mid-elevation, right alongside the split between engine & transmission.

First line will say F23A1 or F23A4. Second line is the block serial #.

F23A1 = VTEC non-ULEV
F23A4 is the ULEV engine.
(F23A5 is the non-VTEC engine from an Accord DX)

 

Says F23A, but no number after the "A."

Thanks,

--tj

 

Will this work?

O2 Oxygen Sensor Front Honda Accord DX SE LX EX Insight | eBay

 

Strange, 'cause JDM engines don't have the final number. If the engine has been swapped, then we don't have much more to go on.

Go to www.ahm-ownerlink.com (Honda owner's link) & register with the car's VIN. That should tell you whether it's originally a ULEV car. Not sure how much that'll help if the engine's swapped.

 

Yes, the engine was swapped.

--jp

 

Generally, there's at least 2 ways to swap engines in a ULEV car. If you bought the car like that, you might not know which way it was done.

1 way...
Keep the ULEV computer, because the ULEV car has a very different wiring harness. Swap all your ULEV sensors over to the new engine. Use your original exhaust manifold because that's different. Basically, you're turning your new enigne into a ULEV engine.

Other way...
Use the non-ULEV computer, and make a lot of wiring changes in the car. Or harvest the donor car for big pieces of it's wiring harness. For example, the computer pin-out is different, so the ULEV oxygen sensor plugs into completely different pins on the computer. ULEV O2 sensor is also powered from a different fuse block. Result is you've turned it into a non-ULEV car.

 

Here's the non-ULEV exhaust manifold.


Here (below) is the ULEV manifold.

 

Thanks. It's the non-ULEV.



--tj