How long does it take for the code to come back on after you pull the battery?
Possible causes
- Faulty Rear Heated Oxygen Sensor Bank 1
- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
Read more: http://engine-codes.com/p0140.html#ixzz2kTNVMLyt
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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had) 
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head 
99 Suzuki Intruder "Trudy" @ 45 mpg
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