P0150 O2 Sensor Circuit Bank 2 Sensor 1

The oxygen sensor before the catalytic converter on bank 2 (sensor 1) is the main control sensor for the mixture. It is either a switching sensor (about 0.1 V lean to 0.9 V rich) or a wide-band sensor that works with a pump current evaluated by an interface chip. Bank 2 exists only on engines with two exhaust manifolds. P0150 is the bank 2 counterpart of P0130. Ford used it up to 2010 as the collective code for wiring faults of the bank 2 wide-band sensor reported by the interface chip and has used specific codes since 2011 (P0151, P0152, P2240/P2247/P2254). Other makers fill it as for bank 1 – an interface voltage check, a collective code or a plausibility test. No bank 2-specific manufacturer thresholds were found. If P0130 and P0150 appear together, look for a shared cause such as supply, ground or the control module. A stored code usually switches mixture control to open loop and suspends adaptation and converter monitoring.

Likely causes

Symptoms

• Check engine light on
• Higher consumption, possibly rough running (no mixture control)
• Higher emissions, possible emissions test failure

Repair estimate

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

What to check first

1. Inspect wiring routed near the exhaust
2. Check for exhaust leaks
3. Watch sensor voltage switching on a scan tool

Parts involved

Related codes

References: law.cornell.edu, newtonnet.co.uk, saabwisonline.com.