Es

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CHECK WHETHER DTC OUTPUT RECURS (DTC P21SS OR P21S6)

(a) Read the DTCs using the intelligent tester.

(b) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.

Result

Display (DTC Output)

Proceed to

No output

A

P21S5 or P21S6

REPLACE ECM

DTC

P2237

Oxygen (A/F) Sensor Pumping Current Circuit / Open(Bank 1 Sensor 1)

DTC

P2238

Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)

DTC

P2239

Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1)

DTC

P2252

Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1)

DTC

P2253

Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1)

HINT:

• Although the DTC titles say oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor.

• Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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