CAR OBD CODES
OBD/DTC Search, e.g.P0147
CAR OBD CODES P0147
P0147 OBD Code Definition:
P0147 O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 3
P0147 OBD Code Description:
OBD2 Code P0147 Definition:
O2 (Oxygen) sensors contain a heating element that allows the sensor to reach operating temperature quickly. This lowers emissions since it allows the engine to reach closed loop faster and also allows the engine to stay in closed loop at idle. The heater circuit is supplied a 12 V battery feed from the PCM or ignition circuit (depending on model) and a ground. The PCM (powertrain control module) monitors how long it takes for the sensors to become active after engine start-up. If it takes too long for the o2 sensors to reach operating temperature, this P0147 can set.
Symptoms
Possible sumptoms of P0147
For this particular o2 sensor, there may be no noticeable symptoms other than: MIL (Malfunction Indicator Lamp) illumination Poor/ rough idle
Possible Causes
Possible causes of P0147
Potential causes of an P0147 code include: Bad o2 sensor heater circuit Bad o2 sensor Wiring harness problems
Possible Solutions
Unplug the Bank 1, 3 sensor. With KOEO (key on engine off) use a voltmeter to check for battery voltage present at the o2 sensor connector (PCM side). (You can also do this with a test light. Connect to ground and touch lead to heater circuit supply. Light should illuminate with KOEO) You should have battery voltage present. a. If voltage is present, check the ground side of the heater element also making sure a good ground is present. If it is, check for any faulty connections & then replace the o2 sensor. If you don’t have a good ground, then there is an open in the ground circuit somewhere that will need to be repaired. Look for wiring harness contact with exhaust components or broken/missing connectors, etc. b. If battery voltage isn’t present with KOEO, check for a blown fuse supplying the heater elements. You may need to get a wiring diagram for this. If the fuse is blown, you’ll need to check for a short to ground on the battery supply circuit before replacing the fuse. If you find none, and replacing the fuse re-establishes battery voltage at the o2 sensor connector, then the o2 sensor may have shorted internally, blowing the fuse. Replace it & recheck. (NOTE: it’s possible for an o2 sensor’s heater circuit to be open/shorted and the o2 sensor to still function). c. If you have no battery voltage present with KOEO and there are no blown fuses supplying the heater circuit, then check for an open on the supply circuit. You can do this by ohming the circuit with the o2 sensor unplugged and the PCM unplugged. Repair and recheck.
Note: The information on the P0147 error code is purely informative, if you need more useful information, please consult your technician.
B1748 B1528 B1679 B0057 B1108 B1A78 B2545 B2A3E B10C5 B1940 B2385 B1792 B2848 B103A B25AD OBDII Chassis Codes
C0121 C1283 C1935 C1164 C1815 C1018 C0256 C2010 C1243 C2009 C1171 C1796 C1423 C1119 C1928 OBDII Network Codes
U047E U0144 U1950 U0456 U2026 U3006 U300E U0328 U2471 U1753 U0512 U045A U0097 U0491 U2610 OBDII Powertrain Codes
P169D P0BF0 P068A P2227 P0757 P1891 P063C P0107 P0B5F P1353 P1119 P084C P060F P0754 P1400