Powertrain, generic · Fuel and air metering

P0130 O2 Sensor Circuit Bank 1 Sensor 1

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

The oxygen sensor before the catalytic converter on bank 1 (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. P0130 is the general circuit code, and manufacturers fill it very differently. Ford used it up to 2010 as the collective code for all wiring faults reported by the wide-band interface chip and has split it into specific codes since 2011. Subaru sets it when the interface voltages leave their range for 5 s, with immediate MIL. GM calls it 'closed loop performance': cross-talk from the heater (signal rises above 2 V with the heater off) or disagreement with the downstream sensor, two trips. A stored code usually switches mixture control to open loop and suspends adaptation and converter monitoring.

Likely causes

Wiring or connector of the bank 1 upstream sensor damaged, corroded or wet
Oxygen sensor faulty internally
Exhaust leak ahead of the sensor or mixture fault (plausibility versions)
Wrong or aftermarket sensor type
Control module or sensor interface chip faulty

Symptoms

  • Check engine light on
  • Higher consumption, possibly rough running (no mixture control)
  • Higher emissions, possible emissions test failure
  • Sensor and catalyst readiness not set

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–350
Time0.5–2 h

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

oxygen sensor bank1 sensor1oxygen sensor wiringengine control module

Related codes

P0131P0132P0134P0135P0150P2243

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