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Old 06-01-2010, 08:34 PM   #1
iluvdrt
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Default P0130 O2 malfunction bank 1 sensor 1

I have been getting this code for awhile now. I bought a new O2 sensor (front one) and the car wouldn't even run. Turns out the O2 heater had a short to ground. I took it back and got another one. The car runs now, but it is still throwing the same code. Could it be I got another bad sensor, or is there an underlying problem?

Things I have checked:
Engine Vacume-about 22" at idle
Fuel pressure-35-40psi
changed crank and cam sensors
cleaned O2 connector
checked for exhaust leak pre-sensor

Any ideas about how to check this out or t-shoot it?
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Old 06-01-2010, 11:24 PM   #2
GrundleJuice
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i assume you have reset the ECU since installing the new sensor? if not, it will take some time for the ECU to experience the conditions necessary for it to re evaluate the data that is/was out of limits.

To troubleshoot with any usefulness you will need to log.

What vehicle is this on, anyway?
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Old 06-02-2010, 06:12 AM   #3
iluvdrt
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Quote:
Originally Posted by RaceFaceXC View Post
i assume you have reset the ECU since installing the new sensor? if not, it will take some time for the ECU to experience the conditions necessary for it to re evaluate the data that is/was out of limits.

To troubleshoot with any usefulness you will need to log.

What vehicle is this on, anyway?
Computer has been reset multiple times to rid the rid the code. It has been set with a scanner and by unplugging the battery.

Vehicle is a 98 Legacy GT wagon. Usually after resetting it takes about 10-15 min of driving before the CEL comes back.
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Old 06-02-2010, 10:02 AM   #4
Sir-Knight
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could there possibly be a short in the engine side of the harness? my 0131 code was resolved with a new sensor, but part of the diagnostic problem was making sure resistance in the engine side harness was over a certain reading.

This was the trouble tree provided to me by a friend with access to snap-on shopkey5

Diagnostic trouble tree P0131

1- Check front O2/afr sensor connector and coupling for water intrusion

yes - completely dry out and pack with dielectric grease
no- go to step 2

2- Check harness between ECM and Front oxygen/AF ratio sensor.

-Turn ignition switch off.
-Disconnect harness from ecm and A/F sensor.
-Measure resistance between ecm plug pins #8 & #9 to chaise ground
-Is the resistance greater them 1M ohms ?

no - repair short in circuit
yes- go to step3

3-Check Poor Contact in A/f sensor plug

-Is there poor contact in the connector?
with a fine paper clip check to see if the female side terminals have drag on the paper clip.

no poor contact- repair terminals
yes good contact- replace a/f sensor
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Old 06-02-2010, 11:14 AM   #5
iluvdrt
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OK, Ill check these out when I get home. Thanks!!
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Old 06-02-2010, 06:08 PM   #6
iluvdrt
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Here is the data log from the freeze frame data when the latest code hit:

Fuel sys- OL
Fuel sys 2-NA
calc load-17%
ECT-183.4
STFT-0.00
LTFT-0.00
MAP-(KPA) 43
RPM-2562
Veh spd-33MPH
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