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For that compound (organophosphates) I know if no electrochemical or collective sensor that would work.
I wouldn't give up just yet.
I can think of 3 potential approaches for detecting engine oil fumes in the cabin and cockpit. (Some development required)
Organophosphate poisoning results from exposure to organophosphates which cause the inhibition of acetylcholinesterase (AChE). Develop an appropriate biosensor system on a chip to detect AChE inhibition. This technology is in its infancy however.
Determine a characteristic absorption spectrum for the Organophosphate bonds and build a narrow frequency spectrometer looking for absorption in a light beam transmitted through an air sample. The P=O double bond coupled with the P-O-H bonds might be sufficient to avoid false alarms and yet give rapid detection.
Add an inactive but distict and easily detected (using present technology) chemical to engine oil. This chemical would be an analog for all the breakdown components of engine oil including the problematic organophosphates.
It is amazing to me that the MSDS for jet engine oil does not reflect the breakdown product hazards we now know to be present. For example :
http://qclubricants.com/msds/ROYCO500.pdf
Sorry to be a pedant but that pic is not an organophosphate. You can't do a spec on it as you don't know the organic groups stucture. I could in the lab on a big IR machine, but I wouldn't expect a pilot to interpet it.