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Ull need to scanit w a factorytool at a privateshop. It reads a datastream to pinpoint issues. Those portabl readers are general. Dont just replaceparts n hope. Oldercars can hav worn wireharness causin weird problms too. Unplug computer n cleanpins..dirt is common in aging vehicles creating issues. Since its jyst an emmission thing udont need to worry its runnin too lean or sumthin crucial
Just my opinion, I'd check for applicable trouble codes, first. Some of the national brand auto stores will check codes for free. If you want to check codes, yourself, at the least, you need an obd2 code reader that will check po codes as well as manufacturer specific codes. See if anything points to tac/throttle actuator control?
There are also accelerator pedal position sensors that you need to check. If you want to clean throttle body, that's fine.
the first code is to do with the secondary air injection optical sensor not reading correctly and i suspect it's that causing the second code which is catalytic convertor reading out of range , so get the optical sensor sorted , may be the ECU or PCM wiring or the sensor itself
Just my opinion, but dealer is blowing smoke up there! Clean your throttle body. This is idler control code. It is VERY common for our TB's throttle body to gum up and get clogged with carbon, because we don't have a pcv system. Disconnect the battery, clean the throttle body, best done if you remove the throttle body. You can even re-use the plastic o-ring/gasket many times over. I find that using Seafoam to clean with plastic bristled brush is the best. Seafoam is sensor safe and cost about $9 a can. Look up on the TUBE, there are many videos there showing how to clean a Trailblazer/Envoy throttle body. Very easy and inexpensive. After that's done, clean that throttle body at least once a year. You'll get better gas mileage with it clean.
P2432 secondary air injector system pressure Sensor circuit low. Have you check the air control solenoid valve itself? Also look for obstruction. It is listed as number 1 in the fiqure.
CODE PO411 - SECONDARY AIR SYSTEM INCORRECT UPSTREAM FLOW DETECTED. POSSIBLE CAUSES, AIR PUMP OUTPUT IS BLOCKED, AIR BYPASS SOLENOID LEAKING OR BLOCKED, AIR BYPASS SOLENOID IS STUCK OPEN OR STUCK CLOSED. AIR INJECTION PUMP HOSES LEAKING, PCM HAS FAILED.
You will need to have the computer scanned for codes, whenever the engine light comes on the computer stores codes that will tell you where the problem is, for example the speed sensor may be bad and if thats the case the code would be a po***** speed sensor, hope this helps.
P0128 is coolant operating temperature operating too low. This can be contributed to the Thermostat stuck open or faulty electronic radiator fan clutch. This is common, I had the same issue and replaced the thermostat and fan clutch and had the clutch re-programmed (required) at the dealer. As for the P0410, check the air pump fuse, if blown it will set this code on. Also check the air pump hoses for water and cracks. Hopefully this helps!!
Code 116- Engine coolant temperature (ECT) sensor out of range, I would replace it.
Code 411- Idle speed system not controlling idle properly (too High)
Code 412- Idle speed system not cotrolling idle properly (too Low)
After replacing the ECT clear codes by disconnecting battery positive for at least ten seconds, see if codes 411, 412 return, if so clean or replace the Idle Air Control solenoid (IAC), repeat clearing of codes. Hope this helps, let me know.
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