Hello. I have a Hyundai Accent, 2001 with 640,000 km (stayed with our family due to an emotional connection). Two months ago I changed gear oil (full replacement) + filter.
When I lowered the carter, there were some pieces of iron caught in the magnets.
Two weeks ago I did a 200km ride and after 100km a light bulb came on.
After I got home, I scanned and came up with 2 codes:
p1529
p0734
When the lamp was lit, a 'knock' was killed in the vehicle.

Also, fuel consumption increased (was a liter to 13 km, now a liter to 10 km) and in addition
I have noise when I press the gas pedal (when I do not press the noise disappears), attached is a video:
(In the garage, they offered to dismantle the dashboard at a cost of $ 600, without committing that they would solve the problem. A catalytic converter was replaced two months ago to renew, so the noise is not related to the converter either.)

I reset faults two weeks ago, and since then they have not returned, but the question is what to do.

 

UP....