20 Most Recent 2011 Hyundai Tucson - Page 9 Questions & Answers

the electronic BEEPER may have failed , take to a hyundai dealer for there diagnosis

Could be be clogged fuel filter or air filter or poor output from fuel pump. Low fuel pressure etc will cause it to "starve" for fuel. Clogged air filters will do similar thing causing it to choke for air. You said it loses power, does that mean it stops running and the engine dies or is it just not giving you as much acceleration as you need. Could also be the drivetrain like torque converter or transmission depending on the model if it is automatic. If it is standard then it would not sound like a drivetrain problem, my first suggestion if to get your fuel filters cleaned and then have a fuel system cleaning done. They will physically clean the throttle body and add a solution to the intake while it is running as well as pour an additive into the fuel tank. First things first, fuel system cleaning, then fuel filter/s. Then check fuel pressure output.

what make you feel like they need adjusting,i cant remember rite now but if you hear them check your oil pressure i had a problem with one and i had to change the oil pump

transfer case 1.5L; Diamond ATF SP-II (if u have 4wd) automatic transmission from 10.5L up to 11.7L; Dexron II

This error means Exhaust Gas Recirculation Flow Insufficient Detected.

You can deatils on the following site http://www.permoveo.ltd.uk/tabid/122/OBD-Error-Code/P0401/Diagnostics/Hyundai/Default.aspx

but for convenience I have reproduced that information here:
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Generic OBD Error Code Details for P0401 Exhaust Gas Recirculation Flow Insufficient Detected What does this mean? OBD Code P0401refers to
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR. SymptomsPossible sumptoms of OBD code P0401
You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms. CausesPossible causes of OBD code P0401
A code P0401 most likely means one or more of the following has happened: •The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced•There is a blockage in the EGR (tube), most likely carbon buildup •The EGR valve is faulty •The EGR valve may not be opening due to a lack of vaccuum Possible SolutionsIn fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit. •Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open •Clean out the EGR valve and/or tubing to remove deposits•Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)•Replace the DPFE sensor (with a good quality / OEM one)•Replace the EGR valve Related CodesP0400 P0402 P0403

1.0 to 1.1mm

Need to check the following: Check if cam belt not broken or stripped 1. Pull out the coil pack and check if plugs are firing. 2. Check for fuel pressure. (3.4 bar) 3. Check compression (12.6 to 14.2 bar) 4. Check if cam and crank sensor are fine 5. Need to carry out machine test.

I don't think you can generally unserviceable item if not working properly try replacing the switch