Today at Atelier Kaz - ex-Honda R&D, F1, Indy/CART engineer

Once again created oil free and fresh surface before installing the
valve cover with the liquid gasket.



Valve covers back in place and put rest of the parts back in place.



The last mounting bolt to be torqued in the specific sequence.
As you don’t need to touch this bolt and nut at the rear mount during
the standard TB service, quite often this process is ignored.





New battery installed and ready for the fireup.
This battery (31500-SV2-011HE) is for the MT model.
AT one requires higher CCA.
This battery is nothing special and shared with other Honda models.
The price of the Honda battery went up a bit (GBP75 compared to GBP65 inc.VAT)
but still covered by the 3 years warranty and you may be able to get some discount
if the garage offer NSXCB discount or if you hold trade account.



Time to fireup the engine.

Carried out the same test method by blipping the TH several times and
there was no oil leakage.


So far so good.
(Notice that there was no CEL at this point).


Had to wait until the fog clears up before going out for the
test driving session.

Went out for the test driving session and even before getting on to
the main road, the CEL showed up.
Fortunately, I kept my Bluetooth OBD2 adaptor on the car so quick scan and
once again, it was the same P0141 code for the rear bank post CAT
O2 sensor heater circuit.

Quit the test driving session and back on the lift again.

As this failure has been intermittent until this point but now it always
comes back every time I clear it or re-start the engine so I think finally
the sensor heater circuit gave up and permanently failed.



To be 100% sure, disconnected the connector and checked the
continuity between the heater element and it was open circuit so
confirmed that it was the sensor heater failure and nothing else.