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P0134: O2 Sensor 1/1 Stays At Center

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: The O2 sensor 1/1 is referred to as upstream oxygen sensor in this test. Upstream oxygen sensor operation is monitored when engine is running for more than 2 minutes and engine coolant temperature is greater than 170°F (76.7°C). DTC may be stored in Powertrain Control Module (PCM) if upstream oxygen sensor signal voltage is .35-.55 volt for 1.5 minutes. Possible causes are: defective upstream oxygen sensor, defective PCM, or defective connectors or wiring.
  1. Start engine and warm engine to normal operating temperature. With scan tool in ACTUATOR TESTS mode, set engine speed at 1500 RPM. Using scan tool, read upstream oxygen sensor state. Upstream oxygen sensor state may also be referred to as 1/1 oxygen sensor state. If upstream oxygen sensor state switches, go to next step. If upstream oxygen sensor state does not switch, go to step  4.
  2. With engine at 1500 RPM, wiggle wiring harness and connector at upstream oxygen sensor while monitoring upstream oxygen sensor state on scan tool. On 2.4L, upstream oxygen sensor is located on the exhaust manifold. On 2.5L, upstream oxygen sensor is located on exhaust pipe, just above the catalytic converter. On all models, if upstream oxygen sensor state does not become locked at center while wiggling wiring harness and connector, go to next step. If upstream oxygen sensor state becomes locked at the center while wiggling wiring harness and connector, repair open circuit on wiring harness or connectors between upstream oxygen sensor and PCM as necessary. PCM is located at driver's side front corner of engine compartment, just below air cleaner assembly. Perform TEST VER-5A .
  3. Turn ignition off. Check for defective wiring or connections at upstream oxygen sensor and PCM. PCM is located at driver's side front corner of engine compartment, just below air cleaner assembly. If no defective wiring or connections exist, test is complete. If defective wiring or connections exist, repair as necessary. Perform TEST VER-5A .
  4. Turn ignition off. Disconnect connector at upstream oxygen sensor. On 2.4L, upstream oxygen sensor is located on the exhaust manifold. On 2.5L, upstream oxygen sensor is located on exhaust pipe, just above the catalytic converter.
  5. On all models, using ohmmeter, check resistance between engine ground and terminal No. 3 (Black/Orange wire) on wiring harness side of connector for upstream oxygen sensor. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open circuit on Black/Orange wire between upstream oxygen sensor and PCM. PCM is located at driver's side front corner of engine compartment, just below air cleaner assembly. Perform TEST VER-5A .
  6. Inspect upstream oxygen sensor connector for corroded, pushed out, miswired or damaged terminals. If terminals are not corroded, pushed out, miswired or damaged, go to next step. If terminals are corroded, pushed out, miswired or damaged, repair as necessary. Perform TEST VER-5A .
  7. Ensure ignition is off. Connect jumper wire between terminal No. 4 (Black/Dark Green wire) on wiring harness side of connector for upstream oxygen sensor and positive battery terminal. Turn ignition on with engine off. Using scan tool, read upstream oxygen sensor voltage.
  8. If upstream oxygen sensor voltage is one volt or less, go to next step. If upstream oxygen sensor voltage is more than one volt, replace upstream oxygen sensor. Perform TEST VER-5A .
  9. Turn ignition off. Disconnect jumper wire from wiring harness side of connector for upstream oxygen sensor and positive battery terminal. Disconnect connectors at PCM. PCM is located at driver's side front corner of engine compartment, just below air cleaner assembly.
  10. Using ohmmeter, check resistance between terminal No. 4 (Black/Dark Green wire) on wiring harness side of connector for upstream oxygen sensor and PCM connector terminal No. 30 (Black/Dark Green wire). If resistance is less than 5 ohms, replace PCM. Perform TEST VER-5A . If resistance is 5 ohms or more, repair open circuit on Black/Dark Green wire between PCM and connector for upstream oxygen sensor. Perform TEST VER-5A .
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