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Hello everyone, I have a question for you. I have a 2007 Yukon XL Denali that I just purchased from a gentleman. The tire pressure sensor light was on and the check engine light was on. My husband used his code reader and it said that it was for the oxygen sensors. We took it to the shop and the mechanic changed all four of the O2 sensors and the check engine light went off for about 20 minutes and came back on. Has anyone had this problem before? can anyone tell me what’s wrong? And the tire pressure sensor warning is still on.
 

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Post the O2 sensor codes. The repair may not be appropriate for the problem that's why the codes came back.

TPMS sensors on the tires have their own battery and transmitter circuitry to send tire pressure signals to the receiver. The batteries are bad. They only last 5-7 years. The batteries may not be replaceable so you may need new sensors. They are not cheap.
 

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Post the O2 sensor codes. The repair may not be appropriate for the problem that's why the codes came back.

TPMS sensors on the tires have their own battery and transmitter circuitry to send tire pressure signals to the receiver. The batteries are bad. They only last 5-7 years. The batteries may not be replaceable so you may need new sensors. They are not cheap.
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Did the mechanic recommend to chànge the O2 sensors or did you?
If he did, do not go back to that shop.
P0054 and P0036 are trouble codes for the O2 sensor heater circuits. The O2 sensors don't necessarily mean they are bad.
Most common heàter circuit faults are damaged wires by touching hot exhaust pipes, loose pins at the sensor connectors, blown fuse supplying 12V to the sensor heater or least cause due to a bad ECM driver for the ground circuit.
The mechanic has to perform a few diagnostics procedures to find the root cause and not just throw parts and hope it fixes it.

The C342D is a different fault than the O2 sensors.

Good luck.
 
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The 54 and the 36 are O2 heater codes for the drivers side cat. This could be a common (to both sensors) problem, perhaps something as easy as a fuse.
Or, as Bel suggested, a damaged wire.

Bel is right, your mechanic should have done a better job narrowing down the problem.
However, if you have 100,000 miles, it's not a bad thing to have new sensors, at least the 2 front ones, they get slow and will waste gas.
New sensors will save a lot of gas.

Sorry, forgot about the C342D.
It indicated a problem with the Throttle Position Sensor. The TPS is mounted to the throttle body and moves the air butterfly when the gas pedal is moved.
You may have to replace it, they do get damaged internally; look up the code and do a little testing.
 
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