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P0121 = TPS Voltage Does Not Agree With MAP sensor signal. That likely means the TPS (throttle position sensor) has gotten dirty inside and is sending out an erratic voltage the computer doesn't like. The usual fix for this is to replace the TPS which is a fairly easy "one-banana" job. The TPS cannot be cleaned when it goes bad, it can only be replaced.
What else can I help you with?
What does a P0123 diagnostic code mean for a 2003 Jeep Wrangler?
Bad throttle position sensor
How many valves does the 2003 Jeep Wrangler have?
The 2003 Jeep Wrangler has 16 valves.
Is the 2003 Jeep Wrangler electric or gas?
The 2003 Jeep Wrangler is a gas-powered vehicle.
What kind of transmission does the 2003 Jeep Wrangler have?
The 2003 Jeep Wrangler has a 5-speed manual.
What size engine does the 2003 Jeep Wrangler have?
The 2003 Jeep Wrangler has an inline 4 engine.
How do you adjust a throttle position sensor on a 2003 jeep wrangler?
The tps is not adjustable on a 2003 Jeep Wrangler.
What is the cam type of the 2003 Jeep Wrangler?
The 2003 Jeep Wrangler has double overhead cam (DOHC).
What is the drag coefficient of the 2003 Jeep Wrangler?
The 2003 Jeep Wrangler has a drag coefficient of .58 Cd.
What is the angle of approach of the 2003 Jeep Wrangler?
The 2003 Jeep Wrangler has a 42 degrees angle of approach.
What is the turning circle of the 2003 Jeep Wrangler?
The 2003 Jeep Wrangler's turning circle is 32.8 ft..
What is the angle of departure of the 2003 Jeep Wrangler?
The 2003 Jeep Wrangler has a 31.9 degrees angle of departure.
What is the maximum payload of the 2003 Jeep Wrangler?
The maximum payload of the 2003 Jeep Wrangler is 800 lbs..
