Continuing P1132 woes... [RESOLVED]

[FlyingVolvo]

In my never ending saga of issues...

Background (time-line of events):

-Had code for Cat Converter (P0422).
-Had original O2 sensors @ 142K.
-MPG is fine.
-No H02 sensor codes.
-Replaced both 02 sensors (OEM front, aftermarket rear).
-Many 100s+ miles later, get P1132 (front O2 sensor problem) + NO difference in driving.
-I checked the connection, and found I hadn't secured it in perfectly. Took apart and re-did it correctly.
-Reset code, drove approx. 1500 miles until now it's back (P1132) + still NO driving issues + MPG is still fine.
-Haven't had Cat Converter code reappear.

I'm getting a bit annoyed by this. The car runs very well, and as far as I know if the front O2 was really bad it would cause bad performance + low mileage. The light has come on in both instances during normal driving, and nothing changed when it illuminated. I know the connection is secured this time.

Any ideas?

[jblackburn]

You could always do this...

Ok, REAL long shot...but similar situation:
http://volvospeed.com/vs_forum/index.ph ... -or-p1132/

we plugged it in and in manual sensor testing it showed that the problem was the ambient temp sensor (in manifold) was bad it showed -39 degrees, thus engine was running very rich causing O2 sensors too send wrong information)

If I recall correctly, there are two of these things up under the bumper, on both sides. I have no idea why there are two, but try switching them and see if the one on your dash reads any different and/or if your code stays away.

[FlyingVolvo]

I like your option #1!

I'll try the sensor thing, although I am a little skeptical. Worth a try I guess!

But of course of my drive back to SD today, I stop at a gas station (CEL on), turn the car back on and magically it's disappeared and stayed off for the remainder of the trip.

Who knows....

[jblackburn]

The computer will clear codes after it goes through a few drive cycles without noticing anything wrong again. I figure you probably already know that though

Maybe your car does what mine does and doesn't like changes in elevation. Every time I go back to NC in hot, humid weather, I get a MAP sensor code.

[FlyingVolvo]

The only issue I ever really have with elevation is that sometimes, after I've gone up to or come down from elevation quickly, if I open the gas cap really fast to fill up, it will seem pressurized and then only let me fill up about half a gallon before the gas pump shuts off. I then have to wait several hours to try again. It's very strange... Seems that I can avoid it by opening the gas cap very slowly. The times that it's happened,

Not sure if that could be related to the O2 sensor, but I'm guessing that maybe it's an evap system issue somewhere?

[jblackburn]

Could be, or it could just be the pumps. Whenever I go to Costco or Kroger for gas, I've found that I have to hold onto the nozzle up and push it further down into the tank - it will keep clicking off when it's just resting there by itself.

The O2 sensor MIGHT be annoyed if there is an EVAP system problem somewhere though...and letting fuel vapors in when it shouldn't. Have you noticed any correlation between these events?

[FlyingVolvo]

Nah, no correlation that I've noticed. Also, I know it's not the pump, since that's what I assumed the first time it happened. So I happily put the car in neutral, pushed it 10 feet to the next pump and the same thing happened. Came back a few hours later of the same pump and it worked fine.

Anyway, I'll keep this thread posted if the light comes back on again... I'm sure it will!

[850tech]

Here is all the diagnostic information for P1132. There are four seperate O2 related faults that may set this one code.

I have underlinded a section in the Signal too high section as a possibility based on the OEM front O2 and Aftermarket rear. It is possible they are not correlating as closely as required.



ECM-280A (P1132) FRONT HEATED OXYGEN SENSOR (HO2S), FAULTY SIGNAL
DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION

Condition

Probe monitoring begins after probe preheating diagnostics are complete. Diagnostic Trouble Code (DTC) ECM-280A is stored if there is a fault in the front Heated Oxygen Sensor (HO2S) or its wiring causing the signal to deviate from its permitted range

The control module registers four different types of fault:

Signal too high
The control module compares the front and rear adaptation values. A Diagnostic Trouble Code (DTC) is stored when the values deviate by more than 3%.
NOTE: The fault may be in the front or rear Heated Oxygen Sensor (HO2S) circuit.

Signal too low
The control module monitors the aging of the probe by checking its dynamics when switching between lean and rich mixtures. The Diagnostic Trouble Code (DTC) is stored if the control module registers that the probe is operating too slowly.

Signal missing
The control module monitors cross-induction from the probe preheating. Diagnostic Trouble Code (DTC) is stored when cross induction exceeds the permitted value.

Faulty signal
A Diagnostic Trouble Code (DTC) stored when:
the control module registers that the signal from the front probe is above 4.8 V for too long
the signal from the front probe does not deviate from [lambda] = 1
the signal from the front probe is showing a lean fuel mixture while the signal from the rear probe is showing a rich mixture
the signal from the front probe is showing a rich fuel mixture while the signal from the rear probe is showing a lean mixture.


Condition

The rear Heated Oxygen Sensor (HO2S) control is disabled
Three-way catalytic converter (TWC) diagnostic is disabled


Possible source

Signal too high:

air leakage in the exhaust system
short-circuit to power supply or ground in the signal cable (+) or supply cable for pump current
defective Heated Oxygen Sensor (HO2S)

Signal too low:

the cable for calibration current and the cable for pump current are short-circuited to each other
open-circuit in signal cable (-)
open-circuit in cable for calibration current
defective Heated Oxygen Sensor (HO2S).

Signal missing:

signal cable (+) and signal cable (-) short-circuited to each other
one of the cables for Heated Oxygen Sensor (HO2S) preheating is short-circuited to the probe's other wiring
defective Heated Oxygen Sensor (HO2S).

Faulty signal:

short-circuit to supply voltage or ground in signal cable (+)
short-circuit to supply voltage or ground in signal cable (-)
short-circuit to supply voltage or ground in pump current cable
short-circuit to supply voltage or ground in calibration current cable
open-circuit in signal cable (+)
defective Heated Oxygen Sensor (HO2S).

Condition

Malfunction Indicator Lamp (MIL) lit.

[FlyingVolvo]

Hmm.... that's interesting, thanks.

I know the rear sensor does not really affect the performance of the car at all, but from what I gather out of that, if the rear one is producing data that is not within 3% of specs, then it triggers a code for the front 02 sensor since it thinks it isn't doing its job?

That may just be it since I've never had this code before and I did use the aftermarket rear one. Doh... If I can more or less conclude that this is the problem and it won't hurt the car (doubt it will?), I guess I'll just leave it until I can buy a new OEM rear one.

It's annoying that FCP sells an aftermarket one like this if it ends up with this issue.

[850tech]

Like I said, it is a possibility, but being 100% for sure is an impossibility without seeing a data stream and back probing the O2S's to see EXACTLY what each is doing in relation to the other. I still recommend going through all the other possible cause just to be sure that there isn't another more simple explaination before replacing anything. Vary small exhaust leaks are also a common cause of O2S signal deviation. Check the connections again as well, pay close attention to the female ends as the pins can spread causing intermittant faults. If all that checks out then I would strongly suspect the difference in O2S's.