The cle illuminated today and I scanned the eng I received a code of p0139 any idea of what o2 sensor to change or should I change all 4 The Jeep has 47000 miles on it. Thanks
Its the downstream oxygen sensor, on bank 1, that is indicating a slow response. Could be a faulty sensor, or a symptom of another issue. If you go to replace it, use OE, or NTK sensors, not bosch. Avoid autozone, as they like to push bosch product like it cures cancer.
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