Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Aids
Control module will not go into closed loop if Code 13 is set. Code 13 may set if vehicle runs out of fuel or stalls while vehicle is in motion. If oxygen sensor ground becomes loose, a false oxygen sensor reading will occur. This can result in a Code 13 being set. On models equipped with an oxygen sensor heating element, element resistance should be 3.5-14 ohms.
| Application | ECM Terminal | Wire Color | |
|---|---|---|---|
| 3.4L (VIN S) "W " Body | |||
| O2 Signal | B21 | Purple | |
| O2 Ground | B20 | Tan | |
| 3.4L (VIN S) "F" Body | |||
| Left O2 Signal | B21 | Purple/White | |
| Left O2 Ground | B20 | Black/White | |
| Right O2 Signal | B22 | Purple | |
| Right O2 Ground | B23 | Black/White | |
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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