Aston Martin P0142 O2 Sensor Circuit Malfunction Bank 1 Sensor 3

Description

OBD-II Trouble Code Description for P0142 Aston Martin

O2 Sensor Circuit

What does this mean?

OBD2 Code P0142 Aston Martin definition:
The oxygen sensors are critical to the engine running properly. It basically informs the PCM (Powertrain Control Module) of oxygen content of the exhaust. The PCM then uses this information to regulate fuel injector pulse. Inaccurate or faulty O2 sensors can cause the PCM to add or take away fuel based on the faulty O2 sensor voltage which can cause a host of problems. A P0142 Aston Martin code definition:the Bank 1,3 O2 sensor or the 3rd downstream (post-cat) O2 sensor on Bank 1. It is a four wire sensor. The PCM supplies a ground circuit and a reference voltage circuit of about 0.5 volts. Also for the O2 sensor heater element there is a battery voltage supply wire and another ground circuit for that. The O2 sensor heater allows the O2 sensor to warm up faster, thus achieving closed loop in less time than it would normally take for the exhaust to warm the sensor up to operating temperature. The O2 sensor varies the supplied reference voltage based on oxygen content in the exhaust. It is capable of varying from about 0.1 to 0.9 volts, 0.1v indicating lean exhaust and 0.9v indicating rich exhaust. This P0142 Aston Martin code indicates that the Bank 1,3 O2 sensor is stuck low for too long or isn’t active at all.

Symptoms

Possible sumptoms of OBD code P0142 Aston Martin
Often post-cat O2 sensor problems present few symptoms since they are inputs to the PCM to monitor catalytic converter quality and don’t directly control fuel. sometimes no symptoms are noticeable. However the following may be possible on some vehicles: MIL (Malfunction Indicator Lamp) illumination Decrease in MPG Increase in tailpipe emissions

Causes

Possible causes of OBD code P0142 Aston Martin
Potential causes of a P0142 Aston Martin code include: Bad O2 sensor Signal shorted to voltage Wiring problems due to contact with exhaust components Holes in exhaust near O2 sensor

Possible Solutions

If you have access to a scan tool, check the signal voltage for the Bank 1,3 oxygen sensor with the engine at normal operating temperature. Is it stuck low currently? If so, increase RPM for a few seconds and see if it affects the reading. If it begins working with increased RPM, check for holes in the exhaust near the O2 sensor that may cause a false lean. If the exhaust pipe is intact, the sensor is sluggish, replace it. If the Bank 1,3 O2 sensor voltage reading remains low with increased RPM, unplug it and then observe the reading. It should have increased to about 0.5 volts or thereabouts. If it did, check for water intrusion or other connector problems. If none are found, replace the shorted O2 sensor. If the voltage reading is still stuck low after unplugging the sensor, then suspect a wiring problem. Using a voltmeter, with the O2 sensor unplugged, check for voltage on the signal circuit at the O2 sensor connector (PCM side). It can vary with model, but should be about 0.5 volts and not above 1 volt. If the voltage reading is too high, repair short to voltage on signal circuit. If the signal voltage checks out, suspect the PCM.

Related Codes

P0141 Aston Martin P0140 Aston Martin P0143 Aston Martin P0144 Aston Martin

The OBD2 Code Information Be Applicable For Aston Martin:

2014 Aston Martin Vanquish Volante,2014 Aston Martin V12 Vantage S,2014 Aston Martin Rapide S,2013 Aston Martin Vantage SP10,2013 Aston Martin Vanquish Q,2013 Aston Martin Vanquish Centenary Edition,2013 Aston Martin V12 Zagato,2013 Aston Martin V12 Vantage Roadster,2013 Aston Martin DB9,2013 Aston Martin CC100 Speedster Concept,2013 Aston Martin AM 310 Vanquish,2012 Aston Martin Virage Volante,2012 Aston Martin Virage,2012 Aston Martin Vantage GT3,2012 Aston Martin V8 Vantage S Roadster,2012 Aston Martin V8 Vantage S,2012 Aston Martin V8 Vantage,2012 Aston Martin Cygnet,2011 Aston Martin Vantage GT4,2011 Aston Martin V8 Vantage N420 Roadster,2011 Aston Martin V8 Vantage N420,2011 Aston Martin V12 Zagato Racecar,2011 Aston Martin V12 Zagato Concept,2011 Aston Martin DBS Carbon Edition,2011 Aston Martin DB9,2010 Aston Martin V12 Vantage,2010 Aston Martin Rapide,2010 Aston Martin One-77,2010 Aston Martin DBS Volante,2009 Aston Martin Vantage GT4,2009 Aston Martin V8 Vantage Roadster,2009 Aston Martin V8 Vantage,2009 Aston Martin Lagonda Concept,2009 Aston Martin DB9 Volante,2009 Aston Martin DB9,2009 Aston Martin Cygnet Concept,2008 Aston Martin V8 Vantage N400,2008 Aston Martin DBS Racing Green,2008 Aston Martin DBS Lightning Silver,2008 Aston Martin DBS Infa Red,2008 Aston Martin DBS,2008 Aston Martin DB9 LM,2007 Aston Martin V8 Vantage Roadster,2007 Aston Martin V8 Vantage N24,2007 Aston Martin V8 Vantage,2007 Aston Martin V12 Vantage RS Concept,2007 Aston Martin DBS,2007 Aston Martin DB9 Volante,2007 Aston Martin DB9,2006 Aston Martin Rapide Concept,2006 Aston Martin DBRS9,2005 Aston Martin V8 Vantage,2005 Aston Martin DBR9,2004 Aston Martin Zagato Vanquish Roadster Concept,2004 Aston Martin Vanquish S V12,2004 Aston Martin DBR9 Prototype,2004 Aston Martin DB9 Volante,2004 Aston Martin DB9,2003 Aston Martin DB AR1,2003 Aston Martin DB7 GT,2003 Aston Martin AMV8 Concept Car,2002 Aston Martin DB7 Vantage Zagato

 

Note:

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

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.