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HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 130 (ENGINE CONTROLS AND FUEL - 2.2L OR 2.4L - INTRODUCTION)REPAIR INSTRUCTIONSHEATED OXYGEN SENSOR 2 REPLACEMENTINSTALLATION PROCEDURE
2008 Chevrolet HHR LT, 2.4 P, Automatic

Installation Procedure

2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2009 Chevrolet HHR. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: A special anti-seize compound is used on the HO2S threads. The compound consists of a liquid graphite and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will have the compound applied to the threads. If a sensor is removed and is to be reinstalled, the threads must have an anti-seize compound applied before installation.
    Fig 1: Locating HO2S
    GM1631783Courtesy of GENERAL MOTORS CORP.
  1. If reinstalling the old HO2S, coat the threads with anti-seize compound GM P/N 12377953 or equivalent.
    2. CAUTION: Refer to Fastener Caution .
  2. Install the HO2S.

    Tighten:  Tighten the sensor to 42 N.m (31 lb ft).

    3. Fig 2: Identifying Trough On Exhaust Heat Shield
    GM1631786Courtesy of GENERAL MOTORS CORP.
  3. Install the HO2S electrical harness lead (2) into the trough (1) on the exhaust heat shield, and bend the trough up slightly.
    4. Fig 3: View Of Engine/Transaxle Harness Electrical Connector
    GM1625489Courtesy of GENERAL MOTORS CORP.
  4. If equipped with a manual transaxle, perform the following steps, connect the engine harness electrical connector (4) to the HO2S.
  5. Install the CPA retainer (3).
    6. Fig 4: Identifying Engine Harness Electrical Connector
    GM1625487Courtesy of GENERAL MOTORS CORP.
  6. If equipped with a automatic transaxle, perform the following steps, connect the engine harness electrical connector (3) to the HO2S.
  7. Install the CPA retainer (2).
  8. If equipped with a manual transaxle, install the wheel drive shaft heat shield. Refer to Wheel Drive Shaft Heat Shield Replacement .
RENDER: 1.0x

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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.