Tuscon will not run loud squeal when trying to start / run. 35,000 mil

@minnesotatuscon

Please verify the ODBII code.

Looking at Hyundai codes it is not listed and online there are OBDII P0052 codes, but no P052 codes.

P0052 refers to a heated Oxygen sensor, bank 2 sensor 1 problem.

Only trouble is your engine only has Bank 1 sensor 1 and Bank 1 sensor 2 which would cause P0030 and P0036 codes unless the code is a Hyundai specific OBDII code

Here's an image showing the location of the two sensors in your vehicle, just in case it is a loose or fractured wire connection to the sensor(s).

(click on image)

Hi @minnesotatuscon

Here's a link showing the possible causes for a P052A code.

Here's an image showing the location of some of the sensors mentioned for the code.

(click to enlarge)