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.

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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 623 (ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM])DTC P0134DIAGNOSTIC PROCEDURE

2008 Mazda 6 s Sport, 4D Hatchback, Standard

Diagnostic procedure

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Diagnostic procedure

WARNING: This page is about a different car, the 2008 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0134 DIAGNOSTIC PROCEDURE CHART

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (HO2S related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING AND STORED DTC NOTE: If fuel monitor DTC, DTC P0132 is retrieved, ignore it until P0134 is fixed. Turn the ignition switch off, then to the ON position. (Engine off) Verify pending and stored DTCs using the M-MDS or equivalent. Is other DTC present?	Yes	Go to the appropriate DTC troubleshooting procedures.
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA Is DTC P0134 on FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to troubleshooting procedures for DTC on FREEZE FRAME DATA. (See DTC TABLE ).
5	INSPECT INSTALLATION OF FRONT HO2S Inspect if the front HO2S is loosely installed. Is the sensor installed securely?	Yes	Go to the next step.
5		No	Install sensor securely, then go to Step 10.
6	INSPECT FRONT HO2S HEATER Inspect the front HO2S heater. (See FRONT HEATED OXYGEN SENSOR (HO2S) INSPECTION ) Is the front HO2S heater normal?	Yes	Go to the next step.
6		No	Replace the front HO2S, then go to Step 10. (See FRONT HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION )
7	INSPECT FRONT HO2S Inspect the front HO2S. (See FRONT HEATED OXYGEN SENSOR (HO2S) INSPECTION ) Is there any malfunction?	Yes	Go to the next step.
7		No	Replace the front HO2S, then go to Step 10. (See FRONT HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION )
8	INSPECT PCM CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the terminal, then go to the next step.
8		No	Go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P0134 COMPLETED Make sure to reconnect all disconnected connectors. Turn the ignition switch to the ON position. (Engine off) Clear the DTC from memory using the M-MDS or equivalent. Perform the KOER self-test (using M-MDS or equivalent) or the HO2S heater, HO2S, and TWC Repair Verification Drive Mode (not using M_MDS or equivalent). (See KOEO/KOER SELF TEST and OBD-II DRIVE MODE ). Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION )
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Perform the AFTER REPAIR PROCEDURE . Are any DTC present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE ).
10		No	Troubleshooting completed.

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.