FYI:
A P0158 code is not typically serious. It simply means that there is a problem in the bank 2, sensor 2 circuit and the power control module (PCM) has stored a code for future reference. There are little to no adverse effects on vehicle performance when this trouble code is present.
See this:>
https://www.engine-codes.com/p0158_jeep.htmlDoes your scanner provide real time data so you can monitor the voltage signal coming from the O2 sensors on that bank? If the downstream sensor is high, then the upstream should also be running high.
From EngineCodes.com wrote:
The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases (lean condition), the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below <0.45 V. If the oxygen in the exhaust gas decreases (rich condition), the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above >0.45 V.
In your situation, you are getting a "Rich" condition (high voltage) signal to the PCM.
Since you have ruled out the O2 sensor by replacing it,
These are some of the possible causes listed:
Failed rear oxygen sensor or connected heater circuit
Wiring is touching the exhaust or its relative parts
The engine is running rich (may present other codes) faulty injector on that bank causing overfueling.
Exhaust leaks causing it to be excessively rich, resulting in a Bank 2, sensor 2 reading that is outside of the normal range.
Shorts, breaks, or exposed wiring or bad PCM (rare)
Image from
https://www.engine-codes.com/p0158_jeep.html
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