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Code P0133 is an upstream oxygen sensor signal fault. If the sensor tests good, you will need to check the wiring. There is a technical service bulletin that requires installing a wiring harness adapter for the upstream oxygen sensor. Here is the bulletin:
NO: 25-16
DATE: 7-31-2003
MODEL:S/V 40
M. YEAR: 2000, 2001, 2002, 2003, 2004
CHASSIS: 415000-030337
SUBJECT: DTC ECM 16
REFERENCE: VADIS
THIS TECH NOTE SUPERSEDES THE PREVIOUS TNN DATED 7-25-03. PLEASE UPDATE YOUR FILES.
DESCRIPTION:
DTC ECM 16 could appear in 2000 to 2004 model year S/V 40 vehicles. The root cause is contamination of the reference air for the front oxygen sensor. An adapter cable will prevent the contamination from affecting the sensor.
SERVICE:
If DTC ECM 16 is detected please follow the instructions below.
Read out and erase the fault code. Refer to Resetting Adaptive Values as described.
Remove the connector cover. Remove the black connector for the front oxygen sensor (four wires) at the connector stay.
Install the adapter cable PN 30650686 in between the disconnected connectors. Route the adapter cable under the other cables.
Place the new connector as shown in the illustration and tie-up the wiring. Install the connector cover. When routing cables make sure the cover stays in place.
Verify that DTC has not returned. If the fault has returned replace the front lambda sond as per VADIS.
Note: Do not remove the adapter cable it replacing the oxygen sensor is necessary.
Resetting Adaptive Values
Instructions for resetting adaptive values are found in the fault tracing instructions for DTC ECM 16 Front Oxygen Sensor.
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I replace both 02 sensors and adptor cable , after 50 miles code came back.
Here is some more information. Please check these items below:
The control module monitors how long it takes for the front heated oxygen sensor (HO2S) to switch between high and low (from rich to lean fuel mixture). Diagnostic trouble code (DTC) ECM-28 is stored if the period is too long or if the difference between the adaptation for the front and rear heated oxygen sensors (HO2S) is greater than a certain value.Substitute Value
Possible Source
Fault Symptom[s]
Engine Control Module:
The engine control module is located on the center console under the dashboard.
You need to check terminal #45 at the ECM for correct power. With key on and engine off it should read 0.5V and with engine running it should fluctuate between 0-1V. The sensor grounds at terminal #75 on the ECM. Please refer to charts below: