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<blockquote data-quote="big dad" data-source="post: 13905877" data-attributes="member: 100697"><p>Bank 1 Sensor 1 and bank 2 Sensor 1 are 02 sensors. The rear sensors are referred too as cat monitors even though they appear too be the same as the aforementioned 02 sensors.</p><p>You need the front sensors too control A/F ratio when in closed loop operation. The rear sensors or cat monitors monitor the effeciency of the cat convertors too scrub the exhaust gases too remain at or below emission standards and stay in compliance with emissions laws.</p><p></p><p>This can be confusing for some too deferentiate between the 4 sensors in the exhaust system. The rear sensors are the ones that are probably turned off in the tune. They are referred too as Bank 1 Sensor 2 and Bank 2 Sensor 2.Code PO125 indicates a problem with Bank 1 Sensor 1 that is not switching or cross counting properly causing a lean miss in that bank. In all likelyhood that sensor has gone bad and needs replacing. Hopes this helps.</p></blockquote><p></p>
[QUOTE="big dad, post: 13905877, member: 100697"] Bank 1 Sensor 1 and bank 2 Sensor 1 are 02 sensors. The rear sensors are referred too as cat monitors even though they appear too be the same as the aforementioned 02 sensors. You need the front sensors too control A/F ratio when in closed loop operation. The rear sensors or cat monitors monitor the effeciency of the cat convertors too scrub the exhaust gases too remain at or below emission standards and stay in compliance with emissions laws. This can be confusing for some too deferentiate between the 4 sensors in the exhaust system. The rear sensors are the ones that are probably turned off in the tune. They are referred too as Bank 1 Sensor 2 and Bank 2 Sensor 2.Code PO125 indicates a problem with Bank 1 Sensor 1 that is not switching or cross counting properly causing a lean miss in that bank. In all likelyhood that sensor has gone bad and needs replacing. Hopes this helps. [/QUOTE]
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