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Vehicle Manufacturer: Peugeot (PSA Peugeot Citroen)
Established: 11/20/1858
Country of Origin: France
Peugeot is a major French car brand, part of PSA Peugeot Citroën, the second largest carmaker based in Europe.
The family business that precedes the current Peugeot company was founded in 1810. On 20 November 1858, Emile Peugeot applied for the lion trademark. The company produced its first automobile in 1891. Due to family discord, Armand Peugeot in 1896 founded the Société des Automobiles Peugeot.
Peugeot's roots go back to 19th-century coffee mill and bicycle manufacturing. The Peugeot company and family is originally from Sochaux, France. Peugeot retains a large manufacturing plant and Peugeot Museum there. It also sponsors the Sochaux football club, founded in 1928 by a member of the Peugeot family.
Peugeot uses the PSA Group diagnostic platform but with differing software from Citroen.
Peugeot Planet is the main interface software using a Lexia 3 interface. Some vehicles based on Fiat platforms also require a CAN bus module to adapt them to the Lexia interface.
Manufacturer Tech Info website:
Technical Information Website Unavailable
EU Specific Manufacturer Tech Info website:
EU Specific Technical Information Website Unavailable
View Manufacturer OBD/Error Code List
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Generic OBD Error Code Details for P0121
Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance
What does this mean?
OBD Code P0121refers to
The Throttle position sensor is a potentiometer that measures the amount of throttle opening. As the throttle is opened, the reading (measured in volts) goes up. The powertrain control module (PCM) supplies a 5 Volt reference signal to the throttle position sensor (TPS) and usually a ground also. A general measurement is: at idle = .5 Volts; full throttle = 4.5 Volts. If the PCM detects that the throttle angle is greater or less than it should be for a specific RPM, it will set this code.
Symptoms
Possible sumptoms of OBD code P0121
Symptoms of a P0121 trouble code could include:
Malfunction Indicator Lamp (MIL) illumination (Check Engine Light or Service Engine Soon light)
Intermittent stumble on acceleration or deceleration
Blows black smoke on acceleration
No start
Causes
Possible causes of OBD code P0121
A code P0121 may mean that one or more of the following has happened:
TPS has intermittent open or short internally
Harness is rubbing and causing an open or short in the wiring
Bad connection at the TPS
Bad PCM (less likely)
Water or corrosion in connector or sensor
Possible Solutions
1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they're close to the specifications mentioned above. If not, then replace the TPS and re-check.
2. Check for an intermittent open or short in the TPS signal. To do that, you can't use a scan tool. You'll need an oscilliscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilliscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes.
3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check.
4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts.
5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair.
6. Look for any water in the connector and replace TPS as necessary.
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