Consistently pops up now.

'Downstream O2 sensor too lean (check for massive vacuum leak, low fuel pressure, bad o2 sensor, or exhaust leaks')

I have a test pipe and o2 spacer with catalyst materiel installed for almost a year now - no issues until now.

O2 spacer fix is: http://www.bigdaddiesgarage.com/mini-cat-cel-fix.html

No vacuum leaks or exhaust leaks i could find.

I do not have a wideband

The FPR vacuum line is good (i zip-tied it first thing when i got the car thanks to the forum ) and the car runs well.

Logging the data using the MIL code reader I find:

O2 1/1 is reading .968 (upstream o2 sensor)
O2 1/2 is reading .888 (downstream sensor)

BUT! Isn't this the proper shift the ECU is looking for?
It is not a zero signal nor equals the upstream sensor output...

so... i assume i need to swap out the O2 spacer with catalyst material...

Is there anything else i should check before ordering one at $50 each?

Thanks!

 

p2096 DTC Logic
https://dl.dropboxusercontent.com/u/...6%20logic.oxps

I'm not sure that b1s1 reading looks right since we have a air fuel sensor as b1s1, if it truly is .968 you might need a new AFS.

What do your Fuel Trims look like? Can you provide a graph or csv?

You'll want to watch:

b1s1 mA draw & voltage
b1s2 mA draw & voltage
MAF g/s
ECT
IAT
Baro
TPS
APP

when b1s2 ho2s fail for a post cat lean condition you'll see < .500mV (usually < .050mV) with little to no switching occurring.

 

^Thanks! This helps.

 

I realized today looking at scan data that we have a 1000mV ho2s in b1s1, so it's not a afs? or at least not one that I'm used to seeing (mostly see toyotas). Though the price seems to suggest we have one...

Try to get logs at idle and 3000 rpm
b1s2 ramping down from > 650 to < 250mV
ECT > 180
fuel trims in single digits.

A Scan data sample, for some reason exporting to a xps document cut the amount of frames in half...

https://dl.dropboxusercontent.com/u/55044707/PIDS.XPS

 

^I will try.

UPDATE:
The code cleared itself as my Lovely Bride took the car on a roadtrip. The code has not returned.... Some problems 'solve themselves', but i will also seek to get a scan.