PanteraKitty

After replacing a clutch or transmission, you may find your way to this TSB while troubleshooting the oxygen sensor fault codes. You will be much happier if you read the TSB first and never see the fault codes.


2000 Honda S2000
DTC P0135, P0141 AFTER M/T REMOVAL
DTC P0135, P0141 AFTER M/T REMOVAL TECHNICAL SERVICE BULLETIN
Reference Numbers): HSN 1101-05, Date of Issue: November, 2001 HONDA: 2000-2002 S2000 CATEGORY: Honda Service News APPLIES TO: All
SERVICE INFORMATION
On '00-02 S2000s, when doing a repair (such as transmission removal) that requires you to remove the primary and secondary heated oxygen sensor (HO2S) connectors, mark or tag the location of these connectors before you remove them. This ensures they get correctly reinstalled. Make a note to do this in step 19 on page 13-8 of your 2000-02 S2000S/M.
If the two HO2S connectors aren't reinstalled correctly, 12 volts from the No. 6 fuse are applied to the ECM when it turns on the oxygen sensor heaters. This voltage will permanently damage the ECM and cause DTC P0135 (primary oxygen sensor heater malfunction), DTC P0141 (secondary oxygen sensor heater malfunction), or both to set.
If one or both of these DTCs are set, don't replace the ECM yet; check the oxygen sensor connections. But if the DTCs come back after you've checked the connections, replace the ECM.
Jt'S AUTOMOTIVE
Monday, August 13, 2007 2:52:13 PM
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justblazesticky

well, this could explain the P0141 code my car gives me (previous owner put an unsprung clutch in it, sucky).

i still haven't gone through all the vacuum hoses as was suggested in another thread (there was an intake system in it previously) that gave another solution to the P0141 code.

How could I tell if these sensors are currently crossed?
If it is the problem for me, its not too big a deal because the car drives just fine. I just wanna make sure not to kill any future aftermarket ecu's.

PanteraKitty

CEL and the fault codes were the indications in mine. The wiring diagrams might show wire colors. The plugs will interchange.

My car still in the shop waiting for the ECM repair so I can't look at itfor you. Maybe someone that is familiar with this will jump in here???

Billman250

Lets stop the myths right here

You CANNOT cross the two O2 sensor connectors, the connectors are different.

You can however screw the O2s into the wrong holes.

You can also (if you are REALLY not paying attention) plug the two connectors from the trans harness into each other. You can also plug the two O2s together.

Billman250

The bulletin HAS TO be referring to pluging the trans harness connections into each other. That would explain the voltage issue.

This would also indicate the O2s are plugged into each other, and isolated from the car.

mxt_77

So, one O2 has a male connector and the other has a female?

justblazesticky

so, does that that mean that the only way to damage the ecm is plugging the two harnesses into each other?

and if, the 02 sensors are plugged into the wrong part of the exhuast system, i imagine their would be some sort of CEL?

PanteraKitty

You are going to make me go look for myself and find out exactly what they did, aren't you? The TSB looks like years 2000 through 2002 have plugs that are alike

Billman250

Correct.

O2 with white wire cover. Male pins. Goes in the header.
O2 with blue wire cover. Female pins. Goes in the cat.

The O2s can accidentally be plugged into each other, as well as the two harness ends by the trans. They cannot be crossed, except for screwing the O2s into the wrong holes.

All cars are the same to AT LEAST 2005.