CAR OBD CODES
OBD/DTC Search, e.g.P0144
CAR OBD CODES P0144
P0144 OBD Code Definition:
P0144 O2 Sensor Circuit High Voltage Bank 1 Sensor 3
P0144 OBD Code Description:
OBD2 Code P0144 Definition:
The catalytic converter is used to lower harmful emissions. To ensure proper operation, there is an O2 sensor located behind the catalyst that monitors the oxygen content of the exhaust after the cat. The PCM (Powertrain Control Module) then compares the post-cat reading to the pre-cat readings to determine if the catalyst is working properly. A P0144 Definition:a fault at the post-cat o2 sensor, indicating that the signal voltage is too high. The o2 sensor is a four wire sensor. Two wires are dedicated to the heating element and two wires are dedicated to the sensor. The heating element should have battery voltage on one wire with key on engine off and ground should be present on the other. The PCM supplies a reference voltage to the o2 sensor which the sensor varies according to oxygen content in the exhaust. It is capable of varying between approximately 0.1 and 0.9 volts. This variance in the voltage is monitored by the PCM. The PCM also supplies a ground to the sensor. P0144 means that the voltage was too high on the signal circuit.
Symptoms
Possible sumptoms of P0144
Symptoms of a P0144 DTC may include: MIL (Malfunction Indicator Lamp) on Engine loses power and misses intermittently May exhibit loss of fuel efficiency
Possible Causes
Possible causes of P0144
Potential causes of an P0144 code include: Bad o2 sensor (Bank 1 Sensor 3) Wiring in contact with exhaust components Engine running rich (If other codes are present) Holes in exhaust near Bank 1 Sensor 3 Short to voltage on signal circuit Bad PCM
Possible Solutions
Start the engine and observe the Bank 1 Sensor 3 (a.k.a. 1/3) o2 sensor voltage. You may need to raise the idle up until the o2 sensor starts switching. If it is stuck high, or close to 1 volt and the voltage doesn’t vary, then check for a good ground on both the heater element and the sensor. Also check that the heater element is being supplied good battery voltage. No heater operation can cause a sluggish sensor. If the grounds are good and the battery voltage is present, then jumper the sensor’s signal wire to the sensor’s ground wire. Now the scan tool should read low or near zero volts. If it does, the wiring is good. Replace the bank 1/3 o2 sensor. If jumpering the signal wire to the ground doesn’t lower the voltage, then check the o2 sensor wiring harness. Make sure there is no contact with hot exhaust components. Ensure good wiring harness connections. If the wiring checks out, then reperform the previous wiring harness checks at the PCM connector. If now the 1/3 o2 sensor reading drops, then there is a wiring problem that isn’t visible. Open the harness and visually inspect the wiring for problems. But if the result is the same, then the PCM may be bad.
Note: The information on the P0144 error code is purely informative, if you need more useful information, please consult your technician.
B140A B112D B2710 B1408 B2460 B1422 B1540 B213A B29AE B0003 B11CA B123D B1130 B202C B1556 OBDII Chassis Codes
C0265 C112D C100E C1154 C0062 C0038 C1705 C199C C1A27 C1862 C1983 C1795 C0146 P0C02 C1400 OBDII Network Codes
U0516 U1201 U1158 U1074 U2516 U0483 U2520 U3002 U1101 U1191 U1141 U0542 U0443 U2002 U0411 OBDII Powertrain Codes
P0993 P0899 P1543 P265E P1303 P1A13 P1696 P082F P1721 P078A P228F P0973 P0561 P278F P216A