vincer77

I have not been able to get my car smogged since putting the engine back in. I am getting a CEL and codes are P0160, 1117 and 1121

P0160 Oxygen Sensor Behind Three Way Catalytic Converter
P1117 Oxygen Sensor Heating P1117 - 1
P1121 Oxygen Sensor Heating P1117 - 1

Car has 98k miles, so i went ahead and replaced all the O2 sensors, but get the same result.

Any ideas?

JM993

Could be lots of things, Vince. For example, you could have an intake leak which the ECU cannot compensate for sufficiently. If the car was running well prior to your engine pull, my guess is the issue might be related to the re-installation in the car. You might want to recheck intake and electrical connections.

Do you have access to a Durametric or equivalent? A look at the fuel trims will help troubleshoot your issue.

Cheers
Joe

vincer77

Car ran well before. Now I find a slight hesitancy at around 2500 rpm. The old O2 sensors were white in color suggesting too lean.

JM993

Could be a vacuum leak. Are you able to look at the data?

vincer77

Do not have a durametric. Will see if I can find one. I did a vacuum check and all was tight.

Martin S.

But my guy has put "min-cats" on my car in the past...as an example check out: http://bigdaddiesgarage.com

vincer77

I got my hands on a PST2. I have all sorts of faults. First one that comes up is

222 Knock sensor pulse test

Other odd issue is that the bank 2 O2 sensor seems dead - but it is a brand new sensor.

Trims are
TRA -.09
TRA2 -.03
FRA .97
FRA2 .96

The tester shows voltage with engine off around 11.5V and with engine running 12.8 - 13.0. Seems low. Putting a voltmeter on the battery shows 14V with engine on.

Could it be a ground issue? Can DME relay drop voltage?

PS - Never used the PST2 tester before - new territory for me.

george996

trim values and voltage looks ok. i see the same voltages as you do.

i would use the pst2 to clear all the fault codes and then see what codes come back.

you mentioned a dead sensor on bank 2, are you talking about ahead or behind cat?

george996

more info

nine9six

Hey Vince,
The new O2 sensors...(direct fit / universal)?

P0160 O2 sensor circuit no activity detected (Bank 2 sensor 1)

Id clear the codes and drive the car around for adaptation purposes to the new sensors. Based upon what Ive read, Id do this multiple times...If still throwing the codes, possible wiring/ground fault (Bank 2 sensor 1)

Wish I could be more certain...

vincer77

Thanks for the reference materials George!

Bank 2 after the cat appears to be the dead sensor.

In the literature you posted, they talk about measuring continuity from the ECM to the O2 sensors. Is DME and ECM synonymous? Where do I access these pins?

So you read low voltages on the PST2 as well, that part is ok?

O2s were sourced from AutohausAZ and were not the ones where they get spliced into the harness. They came with OE connectors.
All the faults do return

nine9six

Yes.
engine ctrl module
digital motor electronice

vincer77

Some good news to report. Checked the O2 wiring and the leads from the O2 connector from car looked to have been pulled away from the connector. Pushed them in and voila - O2 sensor bank 2 works!

Now need to see what is up with knock sensor.

george996

just a guess, one of the knock sensor connections is open from when you installed the engine. Code 222 which is P1386. i would check this first and erase all the codes again.

i think your voltages are ok because mine are about the same.

Code P0160 is consistent your observation about the inactive 02 sensor on bank 2 after the cat.

make sure you didn't mix up the grey and black connectors for the o2 sensors. Black is ahead of cat and grey is behind.

regarding P1117 and P1121 i would check the voltages at the o2 sensor connection in the engine compartment. By the way, the title of that procedure says sensors ahead of cat but it addresses the post cat sensors. Take a look at the procedure for P1115 and P1119 and you will see.

vincer77

I was hoping for the same easy fix on the knock sensor, but no go.

The fault will not clear with the PST2. Not sure if the code is not clearing, or if the code is quickly being reset after clearing.