P1121 throttle position sensor not consistent with mass air flow sensor. I cleaned all connections and mass air flow. Set throttle at 100%. After being driven for 20 to 30 minutes car will go to fail safe (the warmer outside plus 25 c the more it happens), turn it off for a minute,restart and all is well. Now it is happening more frequent. My garage says it is the throttle position sensor, they came across a similar situation. does any one know where I can buy this sensor with out buying the whole throttle body. The sensor part # is LNE1662AB. Has this happened to you and any thoughts

 

Take a look at the XJ8/XJR (x308) forum.
There is a thread going on now about the same part that may help..