po155 code: which sensor is it? also, one more question

po155 code: which sensor is it? also, one more question

Postby dapperdan7 [OP] » November 18th 2011, 1:45am

i know there are 3 on the 2000 safari but my question is: it the one on the passenger or drivers side. I'm pretty sure its one of the two before the cat converter.

aslo, after the first one coming out as easy as butter, the second one i managed to strip the nut on the other sensor. best way to get the **** out? i already have the proper wrench and i still messed it up. heat? vise grips?

thanx

cars like relationships are never easy!

dan
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dapperdan7
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Re: po155 code: which sensor is it? also, one more question

Postby Jasen » November 18th 2011, 1:48am

O2S Heater Circuit
Malfunction
(Bank 2, Sensor 1)
P0155 This DTC determines if
the O2 sensor heater is
functioning properly by
monitoring the amount of
time necessary for the O2
sensor to become active
after start - up.
The elapsed time to obtain  .150V
from the mean O2 bias voltage.
*Time based on table: Time Vs
Average Air Flow
System Voltage > 11.7 but < 17 Volts except 4.3L C/K/G
which is voltage >11.7 but < 18 volts.
(NOTE: If voltage remains outside this window for 4
consecutive seconds, the test is void for this cold start.)
Air Flow < 27 g/sec 4.3L (21 g/s 4.3L M/L only - Denso
Sensors; 35 g/s - 5.7L only)
Engine run time > 2 seconds
ECT < 33C
IAT < 33C
 ECT-IAT  5C
From cold start to a maximum
time of - 115 seconds.
*Time determined by table.
Lt Duty=B
Federal Hvy
Duty=C
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Ultra gauge

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Re: po155 code: which sensor is it? also, one more question

Postby Phantom » November 18th 2011, 3:12am

It the PCM measures the time elapsed (based on coolant temp) that too much time passed before the oxygen sensor began operating properly, if it sees that it has it sets the code , it is often the passenger side , but it seems as you are doing the best thing in replacing all 3 , , be sure to take time to carefully inspect the connecters and wiring condition as they too can set the code by having a short or open or high resistance in wiring harness or harness connectors.


It is best to use heat like a torch before trying to remove , sometimes the only way to get them to move , and it sometimes can take a few tries ,
Phantom
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Re: po155 code: which sensor is it? also, one more question

Postby Leeann_93 » November 19th 2011, 9:36pm

Yep, heat the bung (not the sensor) with a MAPP gas torch or Oxy-Acetylene torch first, then break loose with breaker bar and O2 sensor socket. Before heating, though, spray several times with PB Blaster or other penetrating oil (WD40 need not apply) and tap with something metal - it helps capillary action. The heat helps draw the oil into the threads further along with expanding the bung a little.

On mine, a propane torch wasn't hot enough, but mine were seriously rusted.
'02 Astro LS AWD vin X
'00 Astro LS AWD vin W - WIP
'99 Safari XLE AWD vin W - broke
'93 AWD EXT vin W - real broke
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Re: po155 code: which sensor is it? also, one more question

Postby SatWorld » March 12th 2012, 4:00am

OK, so what's the answer to the original question? :D I have the same code but can't find which sensor is which.
99 Astro Cargo, 319,000+ miles pulling a trailer
4.3L V6 A/C CMFI AWD (that's disconnected)
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