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    Thread: 2001 Jetta Wolfsburg 1.8t code P0170

    1. 01-25-2011 08:04 PM #1
      Hi everybody,

      First timer, here. I know everything I know about my car through this site so thanks!

      I've got a 2001 Jetta Wolfsburg 1.8T with just under 104K miles. It's running fine but I've been chasing down this P0170 code for a few months and now my inspection's due so the pressure's on to get it fixed (as if it wasn't before).

      The car runs fine with the exception of cold starts. I've scoured the forums and hope I haven't missed anything obvious, but here's what I've done so far:
      -replaced MAF (just tested this under load at redline and got readings of ~156 g/s. My car has an APR chip so I assume these readings are good. I aslo assume this rules out the MAF as the culprit.
      -checked for obvious vacuum leaks to no avail
      -replaced pre-cat O2 sensor (was originally throwing P0133 so it wasn't just on a whim)

      I'm still inclined to suspect a vacuum leak and need to do replace the braided lines anyway but it must be a small one. So my questions:
      1. Would VAG-COM give me more info than my OBDII scanner about fuel trim specifically and narrow down the possible issues (ie, determine whether it's a vacuum leak or a sensor failure)?
      2. Since I reset my CEL, all monitors have come back up except the catalytic converter monitor. That one still comes back incomplete. Is it possible the post-cat O2 sensor is involved with that? I know it's not directly involved with fuel trim issues like the pre-cat sensor.
      3. Do any VAG-COM owners in Austin (78704) feel like helping out?

      cheers

    2. 01-25-2011 08:07 PM #2
      Just to be clear, I replaced the MAF, reset the CEL, and then just tested the new MAF as a sanity check today when the P0170 code came back.

    3. 01-25-2011 08:19 PM #3
      And finally, here's the data from my scanner, just in case someone spots something I didn't. I'll be quiet now.

      O2 Monitor Test
      O2 Bank1 Sensor1
      $81 (Values)
      MOD : $10
      MEAS: 118
      MIN : 90
      MAX : 255
      $82 (Values)
      MOD : $10
      MEAS: 128
      MIN : 90
      MAX : 255
      $83 (Values)
      MOD : $10
      MEAS: 99
      MIN : 15
      MAX : 205
      $84 (Values)
      MOD : $10
      MEAS: 51
      MIN : 0
      MAX : 255
      O2 Bank1 Sensor2
      $81 (Values)
      MOD : $10
      MEAS: 118
      MIN : 90
      MAX : 255
      $82 (Values)
      MOD : $10
      MEAS: 128
      MIN : 90
      MAX : 255
      $83 (Values)
      MOD : $10
      MEAS: 99
      MIN : 15
      MAX : 205
      $84 (Values)
      MOD : $10
      MEAS: 51
      MIN : 0
      MAX : 255

      Live Data
      DTC_CNT 1
      FUELSYS1 CL
      FUELSYS2 N/A
      LOAD_PCT(%) 3.5
      ETC(°C) 94
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 3970
      VSS(km/h) 58
      SPARKADV(°) 2
      IAT(°C) 36
      MAF(g/s) 9.25
      TP(%) 7.8
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.005
      OBD OBD&OBD2
      EQ_RAT11 1.999
      O2S11(mA) 2.395
      ------------------
      DTC_CNT 1
      FUELSYS1 OL_Fault
      FUELSYS2 N/A
      LOAD_PCT(%) 43.9
      ETC(°C) 93
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 3595
      VSS(km/h) 53
      SPARKADV(°) 38
      IAT(°C) 33
      MAF(g/s) 15.75
      TP(%) 11.0
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.735
      OBD OBD&OBD2
      EQ_RAT11 0.780
      O2S11(mA) -0.145
      ------------------
      DTC_CNT 1
      FUELSYS1 CL
      FUELSYS2 N/A
      LOAD_PCT(%) 4.7
      ETC(°C) 93
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 1343
      VSS(km/h) 45
      SPARKADV(°) 5
      IAT(°C) 35
      MAF(g/s) 2.25
      TP(%) 2.0
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.585
      OBD OBD&OBD2
      EQ_RAT11 0.750
      O2S11(mA) -0.988
      ------------------
      DTC_CNT 1
      FUELSYS1 CL
      FUELSYS2 N/A
      LOAD_PCT(%) 1.6
      ETC(°C) 93
      SHRTFT1(%) 2.3
      LONGFT1(%) 3.1
      RPM(/min) 759
      VSS(km/h) 27
      SPARKADV(°) 13
      IAT(°C) 38
      MAF(g/s) 2.25
      TP(%) 2.4
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.625
      OBD OBD&OBD2
      EQ_RAT11 0.958
      O2S11(mA) -0.129
      ------------------
      DTC_CNT 1
      FUELSYS1 CL
      FUELSYS2 N/A
      LOAD_PCT(%) 2.0
      ETC(°C) 93
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 1946
      VSS(km/h) 11
      SPARKADV(°) 26
      IAT(°C) 36
      MAF(g/s) 16.25
      TP(%) 6.3
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.665
      OBD OBD&OBD2
      EQ_RAT11 0.787
      O2S11(mA) -0.734
      ------------------
      DTC_CNT 1
      FUELSYS1 CL
      FUELSYS2 N/A
      LOAD_PCT(%) 2.4
      ETC(°C) 93
      SHRTFT1(%) -17.2
      LONGFT1(%) 3.1
      RPM(/min) 781
      VSS(km/h) 5
      SPARKADV(°) 5
      IAT(°C) 38
      MAF(g/s) 7.25
      TP(%) 4.3
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.715
      OBD OBD&OBD2
      EQ_RAT11 0.969
      O2S11(mA) -0.344
      ------------------
      DTC_CNT 1
      FUELSYS1 CL
      FUELSYS2 N/A
      LOAD_PCT(%) 36.5
      ETC(°C) 93
      SHRTFT1(%) 13.3
      LONGFT1(%) 3.1
      RPM(/min) 3542
      VSS(km/h) 28
      SPARKADV(°) 25
      IAT(°C) 34
      MAF(g/s) 46.25
      TP(%) 36.9
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.030
      OBD OBD&OBD2
      EQ_RAT11 0.957
      O2S11(mA) -0.266
      ------------------
      DTC_CNT 1
      FUELSYS1 CL
      FUELSYS2 N/A
      LOAD_PCT(%) 20.0
      ETC(°C) 94
      SHRTFT1(%) 14.1
      LONGFT1(%) 3.1
      RPM(/min) 3629
      VSS(km/h) 53
      SPARKADV(°) 2
      IAT(°C) 34
      MAF(g/s) 52.75
      TP(%) 21.6
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.690
      OBD OBD&OBD2
      EQ_RAT11 0.940
      O2S11(mA) -0.258
      ------------------
      DTC_CNT 1
      FUELSYS1 OL_Fault
      FUELSYS2 N/A
      LOAD_PCT(%) 74.5
      ETC(°C) 95
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 5712
      VSS(km/h) 85
      SPARKADV(°) 35
      IAT(°C) 34
      MAF(g/s) 12.75
      TP(%) 8.2
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.635
      OBD OBD&OBD2
      EQ_RAT11 1.999
      O2S11(mA) 2.320
      ------------------
      DTC_CNT 1
      FUELSYS1 OL-Drive
      FUELSYS2 N/A
      LOAD_PCT(%) 8.6
      ETC(°C) 95
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 4747
      VSS(km/h) 71
      SPARKADV(°) 17
      IAT(°C) 34
      MAF(g/s) 90.75
      TP(%) 15.3
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.730
      OBD OBD&OBD2
      EQ_RAT11 0.841
      O2S11(mA) -0.492
      ------------------
      DTC_CNT 1
      FUELSYS1 OL-Drive
      FUELSYS2 N/A
      LOAD_PCT(%) 2.7
      ETC(°C) 94
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 1043
      VSS(km/h) 58
      SPARKADV(°) 10
      IAT(°C) 36
      MAF(g/s) 2.00
      TP(%) 2.4
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.450
      OBD OBD&OBD2
      EQ_RAT11 0.958
      O2S11(mA) -0.637
      ------------------
      DTC_CNT 1
      FUELSYS1 OL_Fault
      FUELSYS2 N/A
      LOAD_PCT(%) 20.0
      ETC(°C) 93
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 2838
      VSS(km/h) 63
      SPARKADV(°) 23
      IAT(°C) 34
      MAF(g/s) 5.00
      TP(%) 4.7
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.710
      OBD OBD&OBD2
      EQ_RAT11 0.810
      O2S11(mA) -1.023
      ------------------
      DTC_CNT 1
      FUELSYS1 OL_Fault
      FUELSYS2 N/A
      LOAD_PCT(%) 5.5
      ETC(°C) 93
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 2887
      VSS(km/h) 65
      SPARKADV(°) 6
      IAT(°C) 33
      MAF(g/s) 5.25
      TP(%) 5.1
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.595
      OBD OBD&OBD2
      EQ_RAT11 0.945
      O2S11(mA) -0.242
      ------------------
      DTC_CNT 1
      FUELSYS1 OL_Fault
      FUELSYS2 N/A
      LOAD_PCT(%) 5.5
      ETC(°C) 92
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 3196
      VSS(km/h) 71
      SPARKADV(°) 36
      IAT(°C) 33
      MAF(g/s) 15.50
      TP(%) 11.0
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.710
      OBD OBD&OBD2
      EQ_RAT11 0.780
      O2S11(mA) -1.102
      ------------------
      DTC_CNT 1
      FUELSYS1 OL-Drive
      FUELSYS2 N/A
      LOAD_PCT(%) 5.9
      ETC(°C) 91
      SHRTFT1(%) 0.0
      LONGFT1(%) 3.1
      RPM(/min) 3017
      VSS(km/h) 67
      SPARKADV(°) 13
      IAT(°C) 33
      MAF(g/s) 35.50
      TP(%) 16.9
      AIR_STAT OFF
      O2S B1S12--B2S----
      O2B1S2(V) 0.665
      OBD OBD&OBD2
      EQ_RAT11 0.942
      O2S11(mA) -0.391
      ------------------

    4. 01-26-2011 05:14 PM #4
      It was indeed the post-cat o2 sensor in my case. Replacing that did the trick.

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