which engine? F23A1 or F23A4?

If non-ULEV you should be able to get both upstream and downstream
sensors for about $130 +shipping (www.rockauto.com). I'd recommend
Bosch planar type sensor, these designs are more resistant to
contamination than the cheap heated thimble that's in there already.
I'd stay away from Densos, these have cost Toyota, Honda and many
owners to needlessly replace catalytic converters.

However, if you have the ULEV version, then the upstream sensor costs
about $220! I think the OEM may be the NTK pump cell wide band sensor,
which Bosch also reboxes, but not sure.

If the sensor is not working, then your car's ECU may not go into
closed-loop operation. So try to solve these first.

http://www.boschautoparts.com/Produc...nsors/PlanarO2



On Mar 12, 11:53*pm, waynewright <waitnei...@gmail.com> wrote:
> Hi Folks. *My 2001 Accord EX (4-cyl) is at 102,000 miles and throwing
> all of these codes...
>
> P0141 Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2)
> Heater Circuit Malfunction
>
> P0420 Catalyst System Efficiency Below Threshold
>
> P0700 Automatic Transmission Control System
>
> P1166 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Electrical
> Problem
>
> P1298 Electric Load Detector (ELD) Circuit High Voltage
>
> P1768 ???
>
> I don't even know what the last one is. *Any ideas for where a novice
> should start? *I'm out of work until my new job starts in about a
> month, and PA state inspection just around the corner. *Also, I was
> part of the Sept 2002 auto transmission recall covering 1.2 million
> Honda and Accura models, did need and got a new trans for free, but
> the extended warranty on the news trans expired at 100k miles incase
> that is relevant.