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 MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM L3)DTC P0123NOTES

2006 Mazda 6 i, 4D Sedan, Automatic

DTC P0123: Notes

2006 Mazda 6 i, 4D Sedan, AutomaticSECTION Notes

DTC P0123 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0123

TP sensor No. 1 circuit high input

DETECTION CONDITION

If PCM detects TP sensor No. 1 voltage is above 4.9 V ⁽¹⁾ , 4.85 V ⁽²⁾ after ignition switch to ON, PCM determines that TP circuit has a malfunction.

Diagnostic support note

This is a continuous monitor (CCM).
MIL illuminates if PCM detects the above malfunction condition during first drive cycle.
PENDING CODE is available if PCM detects the above malfunction condition.
FREEZE FRAME DATA is available.
DTC is stored in the PCM memory.

POSSIBLE CAUSE

TP sensor malfunction
Connector or terminal malfunction
Open circuit between throttle body terminal B and PCM terminal 2AO
Open circuit between throttle body terminal D and PCM terminal 2AP
Short to constant voltage supply circuit between throttle body terminal A and PCM terminal 2AK
PCM malfunction

Courtesy of MAZDA MOTORS CORP.

⁽¹⁾	California emission regulation applicable ATX model

⁽²⁾	Except for California emission regulation applicable ATX model

RENDER: 1.0x

NO RELATED

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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.