VW Tiguan / DQ500 НЕ ЕДЕТ / ОШИБКА P1735 / ЗАМЕНА ДАТЧИКОВ ДАВЛЕНИЯ В МЕХАТРОНИКЕ

In this video, Roman saves a Volkswagen Tiguan with a DQ500 automated manual transmission (85,000 km, DBGC engine). The customer reported a Check Engine light and the odd gear row would not engage—the transmission would barely move. Diagnostics revealed a P1735 error (K1 clutch pressure sensor malfunction), and when checking the measured values, it turned out the K1 sensor was reading -0.89 bar with the ignition off (tolerance ±0.1 bar). The DQ500 is considered one of the most reliable automated manual transmissions, but it does have its share of problems. We've detailed the entire repair process: 🔧 Diagnostics – how to identify the problem using the P1735 error and sensor readings. 🔧 Draining the oil, removing the mechatronics, and removing the circuit board. 🔧 Replacing pressure sensors K1 and K2 – drilling out spot welds, careful soldering while preserving the "S" compensators. 🔧 Replacing the oil filter and housing – why this is critical for leak tightness. 🔧 Installing the mechatronics system with the specified tightening torque (8 Nm + 45°). 🔧 Basic adaptation – how many attempts were required and why raising the car on a lift ultimately helped. 🔧 Test drive, post-repair sensor checkpoints, and troubleshooting error P1735. Roman shares important details: problems with the drain plug (the ring won't seat), cleaning the "hedgehogs" on the magnets, properly removing the mechatronics connector, and also explains why this engine with a liquid intercooler doesn't require intake cleaning. If you have a VAG with a DQ500 transmission, this video will help you diagnose the problem early and avoid costly repairs. Timecodes: 00:00 – Introduction: Check Engine, odd row shutdown, P1735 error 01:47 – Pressure sensor diagnostics (K1 = -0.89, K2 = 0.02) 03:27 – Repair plan, what needs to be removed 04:58 – Culprits: pressure sensors K1 and K2 06:12 – Starter removal, underhood cleaning 09:31 – Oil drain: nuances with the partition and plastic cup 13:54 – Removing the mechatronics cover and connector 15:27 – Removing the mechatronics unit, draining the remaining oil 18:26 – Mechatronics on the bench: separating the hydraulics from the board 20:59 – Removing the rear and front boards, accessing the sensors 24:47 – Drilling out the spot weld (how to do it carefully) 28:33 – Replacement Sensors, soldering, contact testing 30:13 – S-compensators and resistance testing 33:21 – Digression: why you don't need to clean the intake on this engine 36:51 – Replacing the oil filter housing (important!) 39:12 – Installing mechatronics, tightening torques 41:31 – Basic adaptation: why it doesn't work the first time 45:31 – Adaptation process: 11–12 attempts, raising the car helped 51:35 – Test drive and final sensor readings, troubleshooting P1735 🚗 Service center "AutoTema29" 📍 Arkhangelsk, Okruzhnoye Shosse 3, Bldg. 1, Bldg. 9 📞 +7 (8182) 46-10-46 📧 [email protected] #autotema29 #carservice #carrepair