raphaeljones1
Tucson VANOS Issue
Summary of the thread
A 2004 Hyundai Tucson diesel exhibited a check engine light and increased fuel consumption, leading to a suspicion of an inlet VANOS issue. Possible causes included a faulty camshaft solenoid valve or power supply problems. It was suggested to check the oil condition and use a generic OBDII scanner to identify fault codes. Replacing the camshaft solenoid valves resolved the issue, eliminating the check engine light and normalizing fuel consumption.
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4 comment(s)
raphaeljones1 (community.author)
Oil level is fine, but the oil isn't super clean. I've been lax with maintenance. Should I use a generic OBDII scanner for fault codes, or do I need something more specialized?
johannafire69
A generic OBDII scanner will give you a code. If it points to the VANOS solenoids then that's likely your problem. Given the mileage and slightly neglected maintenance, replacing the solenoids isn't a bad idea. Budget around 250€ for the parts and labor. If that doesn't fix it, you'll need to take it to a workshop to check the VANOS unit itself.
raphaeljones1 (community.author)
New camshaft solenoid valves fixed it! Check engine light is gone, and fuel consumption is back to normal. Cost about 250€, like you said. Thanks!
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HYUNDAI
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TUCSON
johannafire69
VANOS issues on those are pretty common. First thing to check is the oil. Is it clean and at the right level? Sludge can kill those solenoids quick. Also, have you scanned the car for fault codes? Knowing the specific code will help narrow it down.