I recieved a DTC P1121 on my 2002 Toyota Camry. What do I need to do to fix it and is it safe to drive in the meantime?

It is not safe to assume that replacing the intermediate shaft sensor will fix the issue, as the check engine light can be caused by a wide variety of problems. It is best to use a code reader to retrieve the specific diagnostic trouble code (DTC) that is causing the check engine light to come on. This code will give you a better idea of what the problem is and what parts may need to be replaced. You can then use this information to determine the best course of action for repairing the vehicle.

Lots of help here, but check for DTC Codes. If the battery went flat or was disconnected, you need to reset the security system..

https://www.google.com/search?q=2007+toyota+camry+no+spark

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CEL glowing running. (non Hybrid> and what engine, 2.4? or 3.5?)

that means 1 thing, scan me.
it has DTC errors, get them, and use them to solve this riddle.
all cars 1996 to now, USA only. other countries, diffr.
car is PITA fly by wire, (throttle by wire bs)
good luck with that picky system.

car starts, but engine power sux.
its in limphome, its in PITA, throttle by wire limphome.
the DTC will prove that.
its a very touch system. (no cable no spring means , tons of funky software to make car safe )

Well, a lot depends on what is causing the P0340 Diagnostic Test Code (DTC) to set.

The Camshaft Position Sensor (CMP) is a pick-up coil mounted in the outer corner of the left cylinder head just below the valve cover (assuming your Camry is equipped with a V-6...you didn't say)
a one tooth signal plate is mounted to the outer camshaft. DTC P0340 sets when there is no signal recieved from the sensor by the Engine Control Module (ECM) either during engine cranking or engine running.
Possible causes are:
> Open or short circuit in CMP sensor circuit
> Faulty CMP sensor
> Defective starter
> Damaged cam signal plate
> Broken timing belt
> Internal ECM problem
Proper diagnosis required.

Code 14: Igniter circuit, probably a faulty igniter
Code 26: Fuel mixture too rich, possibly a faulty coolant temperature sensor, or faulty oxygen sensor

The RPM sending unit circuit is not sending right data to the ecm.

any existing dtc codes will need to be cleared.you will need the proper scan tool. i recommend the dealership for this procedure.

2002 CAMRY MY ENGINE LIGHT CAME ON - THE DEALERSHIP SAID IT WAS A PO171,P1130,P1135 DO I HAVE TO GET IT FIX. 448.00 IT WILL COST

If the vehicle has been in a rear end collision, expect this. If not, it just may need to have the Occ Class Sys reset. Toyota Dealer only.