What does engine code p152 mean? I have a 2001 Jeep grand cherokee on 2001 Jeep Grand Cherokee

Just started this morning, doesn't seem like there is anything wrong, but the check engine light came on.

by in Freeport, NY on January 20, 2013
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1 answer
ANSWER by , January 20, 2013
SYMPTOM P0152-2/1 O2 SENSOR SHORTED TO VOLTAGE TEST NOTE This symptom is diagnosed using the test P0132-1/1 O2 SENSOR SHORTED TO VOLTAGE. WHEN MONITORED With battery voltage greater than 10.4 volts , engine running for more than 4 minutes and coolant temperature above 180 °F . SET CONDITION The oxygen sensor voltage is above 1.5 volts . POSSIBLE CAUSES Intermittent condition O2 sensor operation O2 sensor signal shorted to voltage O2 sensor signal circuit shorted to O2 heater relay output circuit O2 sensor signal open O2 sensor ground circuit open PCM