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Hey guys, I'm getting really frustrated with my 98 svt. My cel came on and it was a P0131, a bank 1 code, so I replaced it with a ford part, drovce it for a few miles, light came back on, but now with a P0155, a bank 2 code, so I replaced it with a bosch part, cuz I'm broke as hell, drove a few more miles, lights back on, same code, I replaced the MAF as well, any thoughts? I'm gettin really pissed, I'm about to rip the bulb out and sell it, so any help would be appreciated.
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Originally posted by snooprobbyrob:
98 svt. ..P0131, a bank 1 code, so I replaced it with a ford part, drovce it for a few miles, light came back on, but now with a P0155, a bank 2 code.
....I'm about to rip the bulb out and sell it, so any help would be appreciated.
Don't rip the bulb out.
P0131 is for Bank 1 (firewall side) upper and P0155 is for Bank 2 (radiator side) upper. Make sure the correct ones were changed. If the correct ones were changed, you may want to check the connectors or the wiring from the connectors to the PCM
Possible causes:
-- Contaminated HO2S (water, fuel, etc.).
-- Crossed HO2S signal/signal return wiring.
-- Check for water in HO2S connector.
Edit. Bank 1 upper
http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=v6maint&Number=1023736&page=0&view=collapsed&sb=5&o=7&fpart=1
Last edited by Tony2005; 09/13/05 06:11 PM.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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Well I replaced them both so I'm not too woried about replacing the wrong one, what do you mean by crossed signal/signal wires? Cuz when I put the sensor on the wires inside the insulation kinda wrapped around each other, I don't think that'd cause a fuss but it wouldn't be the first time I was wrong. But as far as the water and contamination go they're fine. So lemme know if that's what you mean, I hope it's not.. I really really don't wanna have to do that again, my hands still hurt from squeezin in there. Thanks for the help.
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By "correct ones" he means that there are FOUR o2s on the car.
uppers and lowers, one of each for each bank.
if you replaced the downstream sensors that will have NO AFFECT on the codes.
just because the code went away for a while means nothing.. the code test isn't run when you start the car.. it is only run after a very specific set of things are done (speed, steady state driving, temperature, etc). It can take you a few days to meet those criteria, THEN the test ran and popped the code.
Now you're sittin there thinking "shoot.. it worked for a week"... when resetting the code without touching the car would likely have made the CEL stay off as long.
EDIT: with both codes being present, and at the same time-period, I would suspect something other than sensors.. such as a gross leak, or fuel mixture problem.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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they're both upstream codes, it is wierd how one went away and another appeared when I replaced the first one, but I am unsure as to what else would cause that, I replaced the MAF sensor cuz I have an aftermarket warranty that covered that, it does smell like it's running rich, I just assumed it was due to bad sensors
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Originally posted by snooprobbyrob:
they're both upstream codes,
Yes, we understand that. The question is whether the lowers were replaced instead of the uppers. But let's go back to the TSB.
HEATED OXYGEN SENSOR (HO2S) MONITOR - HO2S SIGNAL CIRCUIT MALFUNCTION
Diagnostic Trouble Code Description Possible Causes
P0131 - HO2S Sensor Circuit Out of Range Low Voltage (HO2S-11) The HO2S sensor is monitored for a negative voltage known as Characteristic Shift Downward (CSD). If the sensor is switching from 0 volts to -1 volts during testing and DTC P0131 is present, the PCM will be in FMEM.
Electrical:
�· Contaminated HO2S sensor or connector (coolant, water, silicone, fuel, oil, etc.)
�· Chafed/damaged wiring
�· Crossed HO2S signal/signal return wiring
�· PCM
HEATED OXYGEN SENSOR (HO2S) MONITOR - HO2S SIGNAL CIRCUIT MALFUNCTION
Diagnostic Trouble Code Description Possible Causes
P0155 - HO2S Sensor Heater Circuit Malfunction (HO2S-21) (Bank 2 Upper)
During testing, the HO2S heaters are checked for opens/shorts and excessive current draw. The code will set when current draw exceeds a maximum calibrated limit or falls below a minimum calibrated limit and/or an open or short is detected. �· Blown fuse
�· Short to VPWR in harness or HO2S
�· Water in harness connector
�· Open VPWR or GND circuit
�· Low battery voltage
�· Poor electrical connections from PCM to HO2S sensor
�· HO2S heater
�· PCM
So based on what Ray and you are saying, it could be that
it was due to running rich (even though you did not get a P0172 and P0175 code).
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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sorry I misunderstood that, both upstream sensors were replaced, and if it's not 02 sensors, or a maf sensor, what do you suppose it is? I might just take it to a ford dealership and have them fix it.
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Before sending it to Ford, which will just replace your O2 sensors, I would suggest trying at least these items.
�· Contaminated HO2S sensor or connector (coolant, water, silicone, fuel, oil, etc.)
Clean/dry the connectors.
�· Blown fuse
Fuse 13
�· Low battery voltage
Check battery voltage, engine off, lights on for 1 minute, 12 to 12.2 volts for battery.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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