Mini P0158 HO2S22 Circuit High Voltage

Description

OBD-II Trouble Code Description for P0158 Mini

O2 Sensor Circuit High Voltage

What does this mean?

OBD2 Code P0158 Mini 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 Mini 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 Mini 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 Mini
Symptoms of a P0158 Mini 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 Mini
Potential causes of an P0158 Mini 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 Mini:

2013 Mini Vision Concept,2013 Mini Roadster,2013 Mini Cooper,2013 Mini Countryman,2013 Mini Clubvan Camper,2013 Mini Clubvan,2013 Mini Clubman Bond Street,2012 Mini Rocketman Concept,2012 Mini Coupe,2012 Mini Clubvan Concept,2012 Mini Bayswater,2012 Mini Baker Street,2011 Mini WRC,2010 Mini Scooter,2009 Mini Cooper,2008 Mini One,2008 Mini Cooper,2008 Mini Clubman,2007 Mini Cooper,2006 Mini Concept,2005 Mini Cooper,2004 Mini XXL,2004 Mini Cooper,2002 Mini Cooper,2000 Mini Seven,2000 Mini Cooper

 

Note:

1. The list of automotive Makes at the right edge of the screen. The currently selected ODB-ii codes is for the Mini makes.

2. Look up the other OBD II Trouble Codes, please use the search box. Enter the 5 character trouble codes in the search box and submit the search.

3. Don’t assume a particular OBD-II code means the same for other auto manufacturers as there are many makes specific codes in use.

4. If your OBD-II trouble codes are for a different car, select that vehicle series before searching for the diagnostic codes because not all OBD2 codes used by one manufacture are used by the other makes.

5. The information contained on this site is presented for informational purposes only. We are not responsible for any actions you take on your vehicle. If you have any doubt as to repairs on your vehicle, please contact your technician.