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Single Fix for Multiple Nissan® O2 Sensor Codes

If one of the following vehicles comes into the shop with the “Malfunction Indicator Lamp” (MIL) “ON” and one or more of the following Diagnostic Trouble Codes (DTCs) are stored in Engine Control Module (ECM), the repair may be as simple as installing an additional ground sub-harness.

Applicable Vehicles
1996-1997 Nissan® Pathfinder®:
DTC P0130, P0150, P0136, or P0156
1998-2000 Nissan Pathfinder:
DTC P0131, P0134, P0138, P0140, P0151, P0154, P0158, P0160
1999-2001 Nissan Frontier® (V-6 Engine Only):
DTC P0131, P0134, P0138, P0140, P0151, P0154, P0158, P0160
2000-2001 Nissan Xterra® (V-6 Engine Only):
DTC P0131, P0134, P0138, P0140, P0151, P0154, P0158, P0160
2002-2004 Nissan Frontier (V-6 Engine Only):
DTC P1143, P0134, P0138, P1163, P0154, P1146, P1166, P0158
2002-2004 Nissan Xterra (V-6 Engine Only):
DTC P1143, P0134, P0138, P1163, P0154, P1146, P1166, P0158

If you retrieve these codes, use the following manufacturer’s Diagnosis and Service Procedure to confirm and repair the condition. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.

Desccription Part Number Quantity
Harness - Engine Sub
Wiring - Clip

Figure 1 - Ground CableDiagnosis and Service Procedure
Review safety procedures in ALLDATA® RepairSM before beginning.

1. Check for poor grounding using a Digital Volt-Ohm Meter (DVOM).

2. Measure the voltage drop between the intake manifold ground bolt for the engine harness and the right hand (RH) cylinder head.

3. At engine warm idle, place the positive (red) meter lead on the intake manifold ground bolt for the engine ECCS harness and the negative (black) lead on RH cylinder head and measure the voltage.
If the voltage is above 0.025V (25 millivolts), install the sub-harness shown in Figure 1 to resolve the incident. Continue with step two of this bulletin.
If the voltage is less than 0.025V (25 millivolts), the problem will not be repaired with a sub-harness and will require further diagnosis. Refer to the System Diagnosis section in ALLDATA Repair.

Figure 2 - Sub-Harness Rounting4. Route the sub-harness from the RH cylinder head, on the existing ECCS harness. Route it toward the center front of the engine and then back toward the intake manifold collector (Figure 2).

5. Find the two threaded holes in the RH cylinder head next to the negative battery cable attachment point (Figure 3).

6. Secure the sub-harness end with the two larger eyelets to these two threaded holes (Figure 3).

7. Use the two new hex bolts to attach the sub-harness eyelets.
CAUTION: To prevent damage, the sub-harness must be positioned more than 70 mm (2.8 in.) from the exhaust manifold.

8. Now attach the sub-harness to the ECCS harness at four (4) places (Figure 4) using the wiring clips listed in the parts information. Space the wiring clips out as shown in Figure 4.

Figure 3 Sub-Harness Secured to Right Hand Head and Intake Manifold

9. Secure the sub-harness end with the two smaller eyelets. You'll attach them using two of the existing ground bolts located on the intake manifold (Figure 3).

10. Trim the excess material from the newly installed wiring clips.

Figure 4 - Sub-Harness Secured to ECCS Harness

Written by ALLDATA Senior Automotive Technical Editor, Rich Diegle. Rich is an Advanced Engine Performance Certified, ASE Master Technician with an AA Degree in automotive technology and 23 years of dealership and independent shop experience.

©ALLDATA LLC. All rights reserved. All technical information, images and specifications are from ALLDATA Repair. ALLDATA is a registered trademark and ALLDATA Repair is a mark of ALLDATA LLC. All other brand names and marks are the property of their respective holders.

Nissan, Pathfinder, Xterra and Frontier are registered trademark names and model designations of the Nissan Motor Company. All trademark names and model designations are being used solely for reference and application purposes.

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