For 1990-2009 cars

### Circuit Description

DTC P0130 determines if the oxygen sensor (O2S) is fluctuating properly. Under certain operating conditions, the O2S voltage should consistently fluctuate over 600 mv and under 300 mv. DTC P0134 tests that the O2S voltage is fluctuating outside the inactive range (391-491 mv), however the O2S output is not used for fuel control until it is consistently fluctuating outside a larger range (300-600 mv). DTC P0130 tests that under certain conditions, the O2S voltage fluctuates outside the larger range. If under certain conditions, the O2S voltage is not fluctuating over 600 mv and under 300 mv, DTC P0130 will set.

### Conditions for Setting the DTC

DTC P0130 will set if the O2S voltage is not fluctuating outside 300-600 mv for 50 seconds when:

• | The TP is greater than 6 percent.

• | The engine is at operating temperature.

• | The engine is in closed loop.

### Diagnostic Aids

The cause is a faulty or contaminated sensor.

To correct the condition, replace the front oxygen sensor (O2S).