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 MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM L3]DTC P2237NOTES

2010 Mazda 5 Sport, 2.3 L, Standard

DTC P2237: Notes

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Notes

DTC P2237 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES

DTC P2237

A/F sensor positive current control circuit open

DETECTION CONDITION

The PCM monitors the A/F signal from the A/F sensor. A/F signal cannot be monitored, and 2AC terminal voltage does not change.

MONITORING CONDITION

Battery voltage: 11-18 V

Diagnostic support note

This is a continuous monitor (A/F sensor, HO2S).
The MIL illuminates if PCM detects the above malfunctioning condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if PCM detects the above malfunction conditions during the first drive cycle.
FREEZE FRAME DATA (Mode 2/Mode 12) is available.
DTC is stored in the PCM memory.

POSSIBLE CAUSE

A/F sensor connector or terminal malfunction
PCM connector or terminal malfunction
Open circuit between PCM terminal 2AD and A/F sensor terminal B
A/F sensor malfunction
PCM malfunction

Courtesy of MAZDA MOTORS CORP.

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.