Cadillac Dts 2007 check engine light goes off after reset but will not stay off,

Nicole Allen

Asked by Aug 15, 2016 at 06:27 PM about the 2007 Cadillac DTS Standard V8

Question type: Maintenance & Repair

The check light is on dropped the car off to be fixed and inspected. idk
what the code is but i was told that it was the Infuriated(??) Air system, had
it fixed and light reset but when the car was shut off and started again the
light came back on this process has been done a few times and the light
will not stay off, what could the problem be? And they will not pass the car
for inspection unless the light goes off and stay's off, plz Help??

6 Answers


Appears as if it Wasn't fixed.. take it back! what codes are stored. simple emissions issue.

Nicole Allen

the code that i was told is P2240, that's all i was told


Possible causes - Air/Fuel Ratio Sensor Bank 2 harness is open or shorted - Air/Fuel Ratio Sensor Bank 2 circuit poor electrical connection - Faulty Air/Fuel Ratio Sensor Bank 2 - Inappropriate fuel pressure - Faulty fuel injectors - Intake air leaks may be faulty - Exhaust gas leaks Tech description What about the obd code? If the IPB 2 terminal voltage is out of a specified range, the PCM detects a malfunction and stores a DTC. Symptoms - Engine Light ON (or Service Engine Soon Warning Light) - High Fuel Consumption - Excessive Smoke from Exhaust P2240 Cadillac Description The front air/fuel ratio (A/F) sensor (bank 2, sensor 1) is installed in the exhaust manifold and detects oxygen content in the exhaust gas. The front A/F sensor transmits output voltage to the powertrain control module (PCM). The PCM controls fuel injection duration by comparing the target air/fuel ratio with the front A/F sensor signal. The sensor includes the VS cell, the pump cell, the atmospheric reference cavity, the diffusion layer, and the heater, and it enables overall feedback control. Right out of the book.

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Best Answer

It looks like they didn't do a roadtest after the first code was fixed or they would have found this one.

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Simple fix upstream HEGO (heated exhaust gas oxygen) sensor. Have it changed $125 done go pass emissions.

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Nicole Allen

They won't pass it for inspection just because the light is on. not that it won't pass emissions,that part will pass, It's really a matter of finding or figuring out why the light will not stay off,and i guess for what was said to me that was the only code that came up. idk Thank you for all your Help, i will give this info to the Mechanic and maybe he can get this fixed, He did say that he tried just about everything he knows so we'll see Thank You

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