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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 134 (Engine Control System - Self-Diagnostics) >> Diagnostic Tests >> DTC P0135 Or P0141: Ho2S 1 Or 2 Heater Performance >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 1  - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store freeze frame data, if applicable. This creates an electronic copy of data taken when fault occurred. Information is then stored in the scan tool for later reference.
  2. 2  - This step checks whether the malfunction that caused DTC P0135 or P0141 is still present. Operating vehicle in check mode enhances diagnostic capabilities of PCM. HO2S heater diagnostic can be monitored on scan tool under I/M SYSTEM INFORMATION selection of SYSTEM INFORMATION. When HO2S Heater test displays a YES status, indicating the oxygen sensor heater diagnostic is completed, check for a DTC P0135 or P0141 in LAST TEST FAILED screen of the scan tool. If there is no DTC P0135 or P0141 displayed, HO2S heater diagnostic has run and passed, indicating no malfunction was present this time. DTCs MUST be cleared to view CURRENT STATUS of the system diagnostics being performed. Do not forget that I/M System Information tests only indicate that test has run, not whether test passed or failed. LAST TEST FAILED screen must be checked for related DTCs to determine the outcome of the diagnostic test involved.
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