Powertrain, generic (extended)

P2298 O2 Sensor Out of Range During Deceleration (Bank 2 Sensor 1)

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2298 is the bank 2 version of P2297 and exists only on engines with two cylinder banks, each with its own upstream oxygen sensor. Three GM tables show the two readings of the code. The 2005 3.5L V6 (L66) tests during fuel cut-off with coolant above 69 °C and below 2,200 rpm, faulting a wide-band output above 4.5 V or below 2.9 V, over two drive cycles. The Bosch-managed 2005 V6 (LP1/LY7) works the other way round and flags a signal above 3.7 V for 10 s while every injector is firing and the target is richer than lambda 1.6. GM's 2024 tables (24OBDG07) set it for a lambda equivalent above 12 from the corrected pump current with the ceramic hotter than 655 °C, 10 s, two trips. No bulletin names P2298. Bank 2 is the side without cylinder 1.

Likely causes

Bank 2 upstream wide-band sensor aged or contaminated

Exhaust leak on bank 2 ahead of the sensor

Damaged sensor lead or connector on bank 2

Symptoms

Malfunction indicator lamp on after two trips
Usually no noticeable change in driving behaviour
Bank 2 fuel trim values may look unusual

Repair estimate

DifficultyEasyDIY possible

Parts and labour€0–350

Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

oxygen sensor

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.