Failed smog test...

gotchopsticks · May 21, 2008

ruined a perfectly good day by failing my smog test. i had the O/R pipe on for around 3 years, with the diablosport tune and mil. had the factory pipe installed, and retored the factory tune. i checked to see if there were any codes last night, and it said there was one for OBD test imcomplete. so then on the way to the smog station my engine light came on and the code description said my computer failed to communicate with the rear bank sensors. so i cleared the code(with the diablosport) and pulled into the smog station. i passed everything on the test, emmissions, gas cap, etc...but i failed because the "computer had no memory". the form says that i failed due to incomplete MIL/OBD test. but if i drive it long enough the chech engine light will come on and i'll fail again. any ideas? did i burn out my O2 sensors? thanks guys.

bdcardinal · May 21, 2008

do you have the O2 sensors deactivated? are MILs installed? you can pick up some cheap aftermarket cat monitors at any parts store to try for the time being.

hotmustang331 · May 21, 2008

Do you have MIL eliminators on the car? If so you need to pull them off....thats the problem. They wont work properly when you put cats back on.

If you dont, then yes your rear 02s are probably dead....I believe they are cheap so shouldnt be a big deal.

gotchopsticks · May 21, 2008

no i do NOT have MILs on the car. i used the internal option from the predator the deactivate the O2 sensors, so i didnt waste money buying MIL eliminators. i restored the computer to the factory settings. so clearing the codes, or erasing the "memory", is a no-no before a smog test?

bdcardinal · May 21, 2008

its a huge nono. its a sign to the smog machine that you are trying to sneak past the test by clearing everything in the computer.

gotchopsticks · May 21, 2008

ok, he said that when i bring it back he'll test it for free, just have to pay for certificate. but when i drive it like 30-40 miles it throws an engine code. if i test with that code present, will i still fail? or do you need the code number to check?

bdcardinal · May 21, 2008

if the light is on, its an immediate fail. you need to fix the source of the problem. what codes are you getting.

gotchopsticks · May 22, 2008

i dont remember the number of the code cuz i cleared it as soon as i saw it, but once i drive enough for the code to come up again ill let you kno. i remember the description being something like "rear bank error" or failure, something bad lol. i think its wierd cuz when i had the O/R pipe in i had to turn off the rear bank sensors to stop the engine light, so i figured that was the same as the MIL elim. but now the factory tune is installed and the factory pipe, so it must be a hardware malfunction, right?

Dragstr05 · May 22, 2008

Why dont you just turn off the rear O2's with the stock midpipe on?

bhuff30 · May 22, 2008

The CEL will come on after every 'driving cycle' when it finds a problem. This means you can clear the codes, but after driving it a certain distance and parking it to cool down, the CEL will come on the next time you start the engine. As you learned, you need at least 1 'driving cycle' to pass emissions.

You'll have to get pull the and fix the problem. We have no idea what the problem is without knowing the exact code. If your rear O2 sensors are plugged in and the computer working, then it is likely you have bad sensors. To keep the sensors clean and working, the heater should be on and working, otherwise they'll foul. Seems like you may have killed the rear O2s by turning them and the heater for them off. Only a guess though.

gotchopsticks · May 22, 2008

ok, pulled the code. it is "0156" and read:" O2 circuit, Bank 2, sensor 2. (see P2272, P2273)" does that help at all? thanks guys

bdcardinal · May 22, 2008

he cant turn them off because the smog machine will know that the cars computer is not monitoring the rear o2s. try swapping rear sensors if you can and see if the code follows the sensor.

gotchopsticks · May 22, 2008

which is bank 2 and sensor 2? what if it is unpluged? the techs at the ford dealer arent too bright from what i have experienced before...

i will try to get under it tomorrow but that is impossible unless i have a jack or ramps...
thanks for the help so far

Notchbck93 · May 23, 2008

pass side rear o2 most likely the one that is after the cat.

P2272
HO2S Signal Stuck Lean Bank 2 Sensor 2
TCM
DTC P0153, P0154, P0160, P1153, P2272, P2273, P2A03, or P2A04

P2273
HO2S Signal Stuck Rich Bank 2 Sensor 2
TCM
DTC P0153, P0154, P0160, P1153, P2272, P2273, P2A03, or P2A04

Swap 02's and see if the problem follows the 02 sensor. So take your pass side 02 post cat and switch it with driver side post 02.

If it is the 02, you will see the following:

P2270
HO2S Signal Stuck Lean Bank 1 Sensor 2
TCM
DTC P0133, P0134, P0140, P1133, P2270, P2271, P2A00, or P2A01

P2271
HO2S Signal Stuck Rich Bank 1 Sensor 2
TCM
DTC P0133, P0134, P0140, P1133, P2270, P2271, P2A00, or P2A01

then you go buy an 02

pete1665 · May 23, 2008

if you have the diablosport, you simply need to turn off the rear O2 sensors, clear the codes, then drive long enough for OBDII to do it's self check. I have gone through emissions twice having my rears turned off via the diablosport and never had an issue. Theres no need to replace the sensors if you have them turned off because they wont cause any red flags to the emissions tester.

what state are you in btw?

**you don't even need to return to the factory tune!!**

gotchopsticks · May 27, 2008

ok, i'll try turning them off and play around with the tunes, and if that doesnt work i will swap the O2's around. im in california, so we have pretty strict emissions here. i just dont want to be sent to the state test only, the guy i bought the car from removed two of the cats from the factory h-pipe and i really dont want to replace them lol. thanks for the help guys.

gotchopsticks · Jun 3, 2008

i unplugged the pass side rear O2 and i got a code saying the heater wasnt workin and the sensor was bad, along with the code i was originially getting, so i assemed i had a bad rear driver sensor. i replaced the sensor with a bosch, and the next day i got the same code. what can i do now? i'll try turning them off cuz i get a free test if i go back to this guy, but any ideas for the mean time?

blubullett · Jun 3, 2008

You just have to turn off the rear sensors using your diablosport, their computer cant tell if you turn them off and it will keep your mil from coming on. After you turn them off drive for a couple days so the computer has memory.

gotchopsticks · Jun 3, 2008

ok, i thought i did that and i just had the engine light come on again, so i went on it again and made sure i put in for O2 configuration:OFF OBDII test:OFF and BID MIL:ON so that should solve the problem?

Killa · Jun 4, 2008

can some one here explaint for me what the **** is smog test ? wat happent if you fails ? and how much its cost ? I really want to know cause Im moving to cali very soon, and now I live where they dont give a **** about emission, you can get inspect sticker with windshield crack, and its cost $5 for the sticker.

Failed smog test...

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