It says you must connect it to the CAN HI and CAN LO, which is a twisted pair of wires that should be blue (Pin 6) and red (Pin 14) supposedly at the OBD socket, according to the instructions: Note that link only has C4, not C4 Picasso (don't know if it is different colours for C4 Picasso variant) Where is the OBD socket? Engine fault repair needed! Hi all, I have a 2011 Citroen C4 1.6 THP 155 Exclusive semi-automatic gearbox. Its engine warning on the dashboard has been on for months due to downstream oxygen sensor, it's recently serviced at the main Citroen dealer, they changed the oxygen sensor and cleared the fault but after 30-40 mins of usage engine Explanation of Citroen Peugeot Nox sensor fault codes. P220A2 - Nox sensor electrical supply. Voltage of component too low. P2200- NOx Sensor Circuit Bank 1. U029D00 - Communication with NOx sensor has a malfunction. U029D - Fault in Communication with the DeNOX system. Diagnostic Connector - Caravan Towing Hitch: 15: 2: Spare-3: Spare-4: Electronic control unit (ECU) - Instrument cluster - Car radio - Diesel fuel additives - Steering wheel control buttons: 20: 5-15: 6: Diagnostic connector: 10: 7: Rain and light sensor: 15: 8: Spare-9: Sunroof - Rear Power Windows: 30: 10: Heated rear window - Heated outside Causes. Possible causes of OBD code P0234 Citroen. – Brake torque (brake on and throttle at wide open). – Transmission oil temperature (TOT) exceeds calibrated threshold. – Engine over temperature. – Ignition misfire exceeds the calibrated threshold. – Knock sensor (KS) failure. Diagbox software can work on Lexia 3 PP2000 Peugeot Citroen scanner.Here are Diagbox V9.12 free download links offered by uobdii.com.. LEXIA-3/PP2000 Function: Unlike other universal car scanner tools which only read fault codes; this software performs nearly ALL the functions like the original dealer diagnostic tool. You will find below several pictures which will help you find your OBD connector in your Citroen C4 Grand Picasso (2006 - 2013). The OBD II plug is located on the left of the steering wheel. Unscrew and remove the plastic cover around the headlights setting command. You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of reliable vehicle information in order to accurately diagnose a code P2291. You may save yourself time by searching for technical service bulletins (TSB) that replicate the code stored, vehicle (year, make, model, and engine), and symptoms exhibited. .

citroen c4 grand picasso obd location