Description
OBD-II Trouble Code Description for P0140 BMW
O2 Sensor Circuit No Activity Detected
What does this mean?
OBD2 Code P0140 BMW definition:
The Powertrain control module (PCM) will provide a .45 volt reference voltage to the Oxygen sensor. When the O2 sensor reaches operating temperature, it will generate a voltage that will vary depending on the oxygen content of the exhaust. Lean exhaust generates a low voltage (less than .45V) and rich exhaust generates a high voltage (greater than .45V). O2 sensors on a specific bank marked as “sensor 2” (as this one is) are used to monitor emissions. A Three-Way Catalyst (TWC) system (catalytic converter) is used to control tailpipe emissions. The PCM uses the signal received from Oxygen sensor 2 (#2 indicates aft of catalytic converter, #1 indicates pre-converter) to read efficiency of TWC. Normally this sensor will switch between high and low voltage at a noticeably slower rate than the front sensor. This is normal. If the signal received from rear (#2) O2 sensor indicates that the voltage has “stuck” between .425V to .474 V, the PCM determines this sensor is inactive and this code will set.
Symptoms
Possible sumptoms of OBD code P0140 BMW
Your check engine light(CEL), or malfuction indicator lamp (MIL) will be illuminated. There will not likely be any noticeable drivability problems other than the MIL. The reason is this: The rear or post catalytic converter Oxygen sensor does not affect fuel deliver(this is an exception on Chryslers). It only MONITORS the efficiency of the catalytic converter. For this reason, you will likely not notice any engine trouble.
Causes
Possible causes of OBD code P0140 BMW
The causes for a P0140 BMW code are fairly few. They could be any of the following: Shorted heater circuit in O2 sensor. (Usually requires replacement of heater circuit fuse in fuse block also) Shorted signal circuit in O2 sensor Melting of harness connector or wiring due to contact with exhaust system Water intrusion in harness connector or PCM connector Bad PCM
Possible Solutions
This is a fairly specific problem and shouldn’t be too difficult to diagnose. First, start engine and warm up. Using a scan tool, watch the Bank 1, sensor 2, o2 sensor voltage. Normally the voltage should switch slowly above and below .45 volts. If it does, the problem is likely intermittent. You’ll have to wait for the problem to surface before you can accurately diagnose. However, if it doesn’t switch, or is stuck then perform the following: 2. Shut off vehicle. Visually check the Bank1,2 harness connector for melting or chafing of the harness or the connector. Repair or replace as needed 3. Turn ignition on, but engine off. Disconnect the O2 sensor connector and check for 12Volts at the Heater Circuit supply and for proper ground on the heater circuit ground circuit. a. If 12V heater supply is missing, check the proper fuses for an open in the circuit. If heater circuit fuse is blown, then suspect a bad heater in the o2 sensor causing a blown heater circuit fuse. Replace sensor and fuse and recheck. b. If ground is missing, trace the circuit and clean or repair ground circuit. 4. Next, with connector still unplugged, check for 5 Volts on the reference circuit. If this is missing, check for 5 Volts at the PCM connector. If 5 Volts is present at the PCM connector but not at the o2 sensor harness connector, then there is an open or short in the reference wire supply between the PCM and the o2 sensor connector. However, if there is no 5 Volts present at the PCM connector, the PCM is likely at fault due to internal short. Replace PCM. ** (NOTE: on Chrysler models, a common problem is the 5Volt reference circuit can be shorted out by any sensor on the car that uses a 5 Volt reference. Simply unplug each sensor one at a time until the 5 Volts reappears. The last sensor you unplugged is the shorted sensor. Replacing it should fix the 5 Volt reference short.) 5. If all the voltages and grounds are present, then replace the Bank 1,2 O2 sensor and re-test.
The OBD2 Code Information Be Applicable For BMW:
2013 BMW X6 M50d,2013 BMW X6,2013 BMW X5 eDrive Concept,2013 BMW X5 Security Plus Concept,2013 BMW X5 M50d,2013 BMW X4 Concept,2013 BMW X1,2013 BMW Pininfarina Gran Lusso Coupe,2013 BMW M6 Coupe US-Version,2013 BMW M6 Coupe,2013 BMW M6 Convertible,2013 BMW M5 US-Version,2013 BMW M550d xDrive Touring,2013 BMW M550d xDrive,2013 BMW M4 Coupe Concept,2013 BMW M135i,2013 BMW Active Tourer Outdoor Concept,2013 BMW 7 ActiveHybrid,2013 BMW 750Li,2013 BMW 7-Series,2013 BMW 640i Gran Coupe,2013 BMW 640d xDrive Coupe,2013 BMW 6-Series Gran Coupe UK Version,2013 BMW 6-Series Gran Coupe,2013 BMW 5 ActiveHybrid,2013 BMW 4-Series Coupe Concept,2013 BMW 3 ActiveHybrid,2013 BMW 3-Series Touring,2013 BMW 3-Series Long Wheelbase,2013 BMW 1-Series 3-door,2012 BMW i8 Spyder Concept,2012 BMW i3 Coupe Concept,2012 BMW Zagato Roadster Concept,2012 BMW Zagato Coupe Concept,2012 BMW M5 UK Version,2012 BMW M5,2012 BMW M3 DTM Champion Edition,2012 BMW M3 CRT,2012 BMW M135i Concept,2012 BMW Active Tourer Concept,2012 BMW 650i Convertible,2012 BMW 640d Coupe,2012 BMW 6-Series Coupe,2012 BMW 6-Series Convertible,2012 BMW 3-Series,2012 BMW 1-Series Urban Line,2012 BMW 1-Series Sport Line,2012 BMW 1-Series Coupe,2012 BMW 1-Series Convertible,2012 BMW 1-Series,2011 BMW i8 Concept,2011 BMW i3 Concept,2011 BMW Z4,2011 BMW X5,2011 BMW X3 xDrive35i,2011 BMW X3 xDrive20d,2011 BMW X3,2011 BMW X1 xDrive28i,2011 BMW M5 Concept,2011 BMW M3 Pickup Concept,2011 BMW M3 GTS,2011 BMW M3 Frozen Gray,2011 BMW ConnectedDrive Concept,2011 BMW ActiveE Concept,2011 BMW 750Li,2011 BMW 5-Series Touring,2011 BMW 5-Series Long-Wheelbase,2011 BMW 5-Series,2011 BMW 335is Coupe,2011 BMW 328 Hommage Concept,2011 BMW 3-Series Coupe,2011 BMW 3-Series Convertible,2011 BMW 1-Series M Coupe US Version,2011 BMW 1-Series M Coupe UK Version,2011 BMW 1-Series M Coupe MotoGP Safety Car,2011 BMW 1-Series M Coupe,2010 BMW Z4 UK Version,2010 BMW Z4 GT3,2010 BMW Z4,2010 BMW X6 M,2010 BMW X6 ActiveHybrid,2010 BMW X5 M,2010 BMW X1,2010 BMW Scooter C Concept,2010 BMW M3,2010 BMW Gran Coupe Concept,2010 BMW ActiveE Concept,2010 BMW 7 ActiveHybrid,2010 BMW 760Li,2010 BMW 7-Series High Security,2010 BMW 6-Series Coupe Concept,2010 BMW 5-Series Gran Turismo,2010 BMW 5-Series ActiveHybrid Concept,2010 BMW 320d EfficientDynamics,2010 BMW 135i Coupe,2010 BMW 135i Convertible,2009 BMW X6 UK Version,2009 BMW X6,2009 BMW X5 xDrive35d BluePerformance,2009 BMW X5 Security Plus,2009 BMW X5 Security,2009 BMW X3 Limited Sport Edition,2009 BMW M3 Saloon UK Version,2009 BMW M3 Race Version,2009 BMW M3 Convertible UK Version,2009 BMW M3 Convertible,2009 BMW EfficientDynamics Concept,2009 BMW 750Li,2009 BMW 730d,2009 BMW 7-Series UK Version,2009 BMW 7-Series,2009 BMW 5-Series Gran Turismo Concept,2009 BMW 335d BluePerformance,2009 BMW 3-Series UK Version,2009 BMW 3-Series Touring UK Version,2009 BMW 3-Series Touring,2009 BMW 3-Series,2009 BMW 1-Series Convertible UK Version,2008 BMW X5 M-Package,2008 BMW X1 Concept,2008 BMW M5 Touring,2008 BMW M3 Sedan US-Version,2008 BMW M3 Sedan,2008 BMW M3 Coupe US-Version,2008 BMW M3 Coupe UK Version,2008 BMW M3 Coupe,2008 BMW M1 Concept,2008 BMW M-Zero Concept,2008 BMW GINA Light Visionary Model Concept,2008 BMW EfficientDynamics Concept,2008 BMW Coupe Range,2008 BMW 7-Series ActiveHybrid Concept,2008 BMW 650i Convertible,2008 BMW 635d Coupe,2008 BMW 530i,2008 BMW 5-Series Touring,2008 BMW 5-Series Security,2008 BMW 5-Series,2008 BMW 135i Coupe,2008 BMW 128i Convertible,2008 BMW 1-Series Range,2008 BMW 1-Series Coupe,2008 BMW 1-Series Cabrio,2008 BMW 1-Series 5-door,2008 BMW 1-Series 3-door,2007 BMW X6 Concept,2007 BMW X6 ActiveHybrid Concept,2007 BMW X5 4.8i,2007 BMW X5 3.0d,2007 BMW X3,2007 BMW M6 Convertible Neiman Marcus,2007 BMW M6 Cabrio,2007 BMW M5,2007 BMW M3 Concept,2007 BMW Hydrogen 7,2007 BMW Concept CS,2007 BMW 530Li,2007 BMW 335i Coupe,2007 BMW 335i Convertible,2007 BMW 1-Series tii Concept,2006 BMW Z4 Roadster,2006 BMW Z4 M Roadster,2006 BMW Z4 M Coupe UK version,2006 BMW Z4 M Coupe,2006 BMW Z4 Coupe,2006 BMW Mille Miglia Coupe Concept,2006 BMW Art Car Collection,2006 BMW 7 Series High Security,2006 BMW 760Li,2006 BMW 750i,2006 BMW 750Li with Shadow Line,2006 BMW 750Li,2006 BMW 330i,2006 BMW 325i Touring,2006 BMW 320si E90 WTCC,2006 BMW 320si,2006 BMW 320d Touring,2006 BMW 320d,2005 BMW Z4 Coupe Concept,2005 BMW X5,2005 BMW X3 EfficientDynamics Concept,2005 BMW X3,2005 BMW M6,2005 BMW M5,2005 BMW H2R,2005 BMW 630i,2005 BMW 545i Touring,2005 BMW 530xi Touring,2005 BMW 530xi,2005 BMW 530d Touring,2005 BMW 330i M-Package,2005 BMW 320d Touring,2005 BMW 130i M-Package,2005 BMW 130i,2005 BMW 120i UK Version,2005 BMW 120i,2005 BMW 120d,2004 BMW X5 4.8is,2004 BMW X5 4.4i,2004 BMW X3 3.0i,2004 BMW X3 2.0d,2004 BMW H2R Hydrogen Racecar,2004 BMW Concept M5,2004 BMW 645Ci Convertible,2004 BMW 645Ci,2004 BMW 5 Series,2004 BMW 530i,2004 BMW 530d,2004 BMW 330Ci Coupe,2004 BMW 330Ci Convertible,2004 BMW 330Cd Coupe,2004 BMW 325Ci Coupe,2004 BMW 320Cd Convertible,2004 BMW 318Ci Convertible,2003 BMW Z4 2.5i,2003 BMW Z4,2003 BMW M3 CSL,2003 BMW 760Li E66,2003 BMW 325ti Compact,2003 BMW 3-Series Compact,2002 BMW xActivity Concept,2002 BMW X5 4.6is,2002 BMW CS1 Concept,2002 BMW 7 Series,2002 BMW 760i,2002 BMW 760Li Yachtline Concept,2002 BMW 740d,2002 BMW 730d,2002 BMW 3-Series Touring,2002 BMW 3-Series,2001 BMW Z8
Note:
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