Kia P0158 HO2S22 Circuit High Voltage

Description

OBD-II Trouble Code Description for P0158 Kia

O2 Sensor Circuit High Voltage

What does this mean?

OBD2 Code P0158 Kia 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 P0158 Kia definition:a fault at the post-cat o2 sensor on bank 2 (second sensor back on bank 2), 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 of 0.5 volts to the o2 sensor which the sensor varies according to oxygen content in the exhaust. The PCM also supplies a ground to the sensor. Changes in oxygen content cause resistance changes in the o2 sensor. This change in resistance affects the PCM-supplied 0.5 volts. It is capable of varying between approximately 0.1 and 0.9 volts. A reading of 0.1 indicates full lean and 0.9 indicates full rich. This variance in the voltage is monitored by the PCM. A P0158 Kia code means that the voltage was higher than normal on the signal circuit. NOTE: A post-catalyst o2 sensor will normally switch slower and fewer times than front (pre-cat) o2 sensors.

Symptoms

Possible sumptoms of OBD code P0158 Kia
Symptoms of a P0158 Kia DTC may include: MIL (Malfunction Indicator Lamp) on Engine loses power and misses intermittently May exhibit loss of fuel efficiency Engine running rich

Causes

Possible causes of OBD code P0158 Kia
Potential causes of an P0158 Kia code include: Bad o2 sensor (Bank 2 Sensor 2) Wiring in contact with exhaust components Engine running rich (If other codes are present) Holes in exhaust causing PCM to over-rich engine resulting in an abnormally high Bank 2, sensor 2 reading Short to voltage on signal circuit Bad PCM

Possible Solutions

It’s always a good idea to observe the condition of the exhaust components. Inspect for holes, wiring harness making contact with exhaust, etc. Start the engine and observe the Bank 2 Sensor 2 o2 sensor voltage. On rear o2 sensors you may need to raise the idle up until the o2 sensor starts switching if the sensor is sluggish. If raising the idle causes the sensor’s voltage to drop, then replace the sensor due to sluggishness. If, after starting the engine and warming to operating temperature, the 2,2 oxygen sensor is observed to be stuck high, or close to 1 volt and the voltage doesn’t drop or vary, then turn the engine off. With KOEO (key on engine off) unplug the 2,2 o2 sensor and 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, but will usually have codes associated with it. 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 2/2 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 recheck the previous wiring harness checks at the PCM connector. It may be necessary to clip the o2 sensor signal wire close to the PCM in a location that is easily accessible so it may be repaired after this test. If now the 2/2 o2 sensor reading drops, then there is a wiring problem that isn’t visible. Open the harness and visually inspect the wiring for problems on the signal wire. Or you may choose to run another signal wire by clipping and leaving the offending wire in the harness. But if the result is the same, then the PCM may be at fault.

The OBD2 Code Information Be Applicable For Kia:

2013 Kia Sorento,2013 Kia Provo Concept,2013 Kia Niro Concept,2013 Kia K9,2013 Kia Cross GT Concept,2013 Kia Ceed SW,2013 Kia Ceed,2013 Kia Carens,2013 Kia CUB Concept,2012 Kia Soul,2012 Kia Rio,2012 Kia Ray,2012 Kia Picanto,2012 Kia K2,2012 Kia Grand VQ-R,2011 Kia Sportage,2011 Kia Sorento,2011 Kia Pro Ceed,2011 Kia Optima Hybrid,2011 Kia Optima,2011 Kia Naimo Concept,2011 Kia KV7 Concept,2011 Kia GT Concept,2011 Kia Cadenza,2010 Kia Venga,2010 Kia Soul,2010 Kia Sorento,2010 Kia POP Concept,2010 Kia Forte Koup,2010 Kia Forte,2010 Kia Ceed SW,2010 Kia Ceed,2009 Kia VG Concept,2009 Kia Soul,2009 Kia Optima,2009 Kia No3 Concept,2009 Kia Magentis,2009 Kia Borrego,2008 Kia eco ceed Concept,2008 Kia Pro-cee-d,2008 Kia Picanto,2008 Kia KOUP Concept,2007 Kia cee-d,2007 Kia Rondo,2007 Kia Kue Concept,2007 Kia Carens,2006 Kia Sportage,2006 Kia Spectra

 

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