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I've had a FF16 code on my 93 XJS 4.0 since I got the car running. However, I didn’t get too far in looking into it as I couldn’t get the sensor out of the tube to try cleaning it, and yes, I did download the AJ6 manual and saw how to diagnose the issue, but it seemed to be running fine with the code so I wasn’t too concerned. I have one day off in between six twelve hour shifts and don’t like getting too tied up in stuff so I thought I would look into it. I had read through the flow chart for the code and started at square one. I was getting no power at the connector so the next step was checking continuity across the wire. Then I thought about it and went huh. When I was trouble shooting trying to get the car starting back when, I thought I’d clean up the ECU connectors and dielectric grease them. I have since had a couple of issues that seemed to stem from the grease, so I pulled the ECU and cleaned everything up. I was going to connect my multimeter to the end of the wire, but couldn’t remember what the exact color was. So I went back to the engine connector and looked at it. Blue with a black slash. Then I realized that I never really looked at the wiring itself. The connector looked good, but as soon as I gave a slight tug on the wire it pulled out of the connector! After fighting to get the plug out for over an hour(it’s apparently a double clip design) and sweating like a pig, it came out! I tried to open the end to put the wire back in and the end broke off argh! I ended up soldering the wire into the plug. I hooked everything back up and tried to start it. It just spun and spun! Oh no! I let off and tried again! It fired right up, but did the “searching” idle for a couple of minutes, then steadied out. No more code! Long story short, as usual, had I kept it simple, I would have found the wire and saved some time, also, had I had known it was a double clip connector, I would have saved even more time! Oh well. Now we’ll see if it makes any difference!
Last edited by Timeisrelative; Jul 29, 2019 at 02:04 PM.
Fixed my FF16 code!
