P0030 Oxygen sensor heater circuit fault on bank 1 sensor 1

HO2S heater control circuit (bank 1 sensor 1)

Monitor

A heater circuit fault keeps the upstream oxygen sensor from warming up quickly, which mostly raises emissions and fuel use. KBB calls it not immediately critical but says it needs prompt attention.

It gets more serious if:

  • Inspect soon: Inspect soon if the engine runs rough, loses power or the check engine light flashes.

Source: how we rate severity

P0030 in short

P0030 means the heater circuit of the upstream oxygen sensor on bank 1 has a fault. Likely causes are a failed sensor heater, damaged wiring, a blown fuse or a power or ground problem. The car usually runs, but fuel economy and emissions suffer. Get it checked soon.

The upstream oxygen sensor has a heater so it works soon after start-up. If the computer finds the heater circuit open, shorted or out of range, it sets P0030.

KBB lists a failed heating element, wiring damage, power or ground problems, a blown fuse, battery problems and a failed computer driver. Symptoms are a check engine light, slow sensor response at start and worse fuel economy.

Ford has a 2013 bulletin where P0030 is stored with P0132, P0135, P2243 and P2251 on the Escape, Fusion and MKZ, and a 2012 Expedition and Navigator bulletin where it can appear with P0135 and P0155.

Most likely causes

  1. Failed sensor heater element

    Common general cause
    Why it ranks here
    KBB lists a failed heating element first.
    What would change this
    Rises if the heater resistance is out of specification. Falls if it is in range.
    How to test the oxygen (o2) sensor

  2. Wiring, fuse or power or ground fault

    Common general cause
    Why it ranks here
    KBB lists wiring damage, blown fuses and power or ground problems.
    What would change this
    Rises if the heater has no supply or ground at the connector or a fuse is blown. Falls if both are present.
    How to test the underhood fuse block (engine compartment fuse box)

  3. Ford powertrain computer related fault (some models)

    Supported by vehicle data
    Why it ranks here
    Ford's 2013 Escape, Fusion and MKZ bulletin stores P0030 with several oxygen sensor codes, so the computer or a shared circuit may be at fault.
    What would change this
    Rises if several heater codes are stored on those models. Falls if only P0030 is stored.

  4. Engine computer heater driver

    Possible — needs testing
    Why it ranks here
    KBB lists a failed computer driver as less likely.
    What would change this
    Rises only after the sensor and wiring test good.
    How to test the engine control module (ecm / pcm)

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read all codes and note any other oxygen sensor heater codes.

    Low riskTool: OBD-II scan tool

    • IfSeveral heater codes (such as P0135 or P0155) are stored

      It meansCheck the shared fuse or supply first.

      Go to step 2

    • IfP0030 is alone

      It meansTest the sensor heater.

      Go to step 3

  2. Check the heater fuse and the supply and ground at the sensor connector.

    Use cautionTool: multimeter

    Warning:Work with the engine off and cool; exhaust parts are hot.

  3. Measure the sensor heater resistance against the service manual.

    Use cautionTool: multimeter

    Warning:Work only on a cool exhaust and use proper tools.

Symptoms

  • Check engine light
  • Slower oxygen sensor response at start-up
  • Reduced fuel economy
  • Rough running or power loss Gets more serious: stop and have it checked.

How to fix

Parts and cost context

  • Oxygen (O2) sensor:Replacing the sensor is the usual repair for a failed heater. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Ford

  • 2013 · Fusion

    Supported by vehicle data

    Ford TSB 14-0129 stores P0030 with several oxygen sensor codes on 2013 Escape and Fusion. Whether it is still current is not verified.

  • TSB 14-0129Status unverified

    P0030 stored with other oxygen sensor DTCs, 2013 Escape, Fusion, MKZ

    2013escape, fusion · NHTSA 10056662

    P0132, P0135, P0030, P2243 and P2251 are stored in PCM memory and light the MIL. The NHTSA summary does not give the repair. Also covers Lincoln MKZ.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Hummer

  • 2006 · H3

    Supported by vehicle data

    Hummer bulletin 3508C covers this code: sES light and reduced power with P0030 and others, H3. Whether it is still current is not verified.

  • 3508CStatus unverified

    SES light and reduced power with P0030 and others, H3

    2006h3 · NHTSA 10018910

    Service engine soon light and reduced power message with several codes including P0030 and P0135 on the 2006 Hummer H3; inspect powertrain relay operation.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Land Rover

  • 2016–2018 · Discovery

    Supported by vehicle data

    Land Rover bulletin LTB01191NAS1 covers this code: mIL with P0030-29 and P2251-13 stored, Land Rover. Whether it is still current is not verified.

  • LTB01191NAS1Status unverified

    MIL with P0030-29 and P2251-13 stored, Land Rover

    2016–2018discovery, range-rover, range-rover-sport, range-rover-velar · NHTSA 10142779

    Engine MIL may be lit with P0030-29 and/or P2251-13 stored in the PCM on 2016-2018 Discovery and Range Rover models.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Nissan

  • 2020 · Murano

    Supported by vehicle data

    Nissan bulletin NTB20-044 covers this code: mIL on with A/F sensor 1 heater codes including P0030, Murano. Whether it is still current is not verified.

  • NTB20-044Status unverified

    MIL on with A/F sensor 1 heater codes including P0030, Murano

    2020murano · NHTSA 10177219

    MIL on with air/fuel sensor 1 heater codes including P0030 on the 2020 Murano.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Lincoln

  • 2012 · Navigator

    Supported by vehicle data

    Lincoln bulletin TSB-13-5-7 covers this code: mIL with P0135, P0155 and possible P0030, Expedition and Navigator. Whether it is still current is not verified.

  • TSB-13-5-7Status unverified

    MIL with P0135, P0155 and possible P0030, Expedition and Navigator

    2012navigator · NHTSA 10052769

    MIL lit with P0135, P0155 and possibly P0030 on some 2012 Expedition and Navigator. The summary does not give the repair.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P0135The heater in the upstream oxygen sensor on bank 1 isn't working as the computer expects

    Shares causes Supported by vehicle data

    P0135 is the matching heater fault for the bank 1 sensor 1 on many vehicles, and Ford stores it with P0030.

All Oxygen sensors codes

P0030 questions

Is it safe to drive with P0030?

Usually yes for a short time, but fuel economy and emissions get worse. Have it fixed soon.

Sources and review

  1. P0030 HO2S Heater Control Circuit (Bank 1 Sensor 1) — Kelley Blue Book
  2. Ford TSB 14-0129, P0030 with other oxygen sensor codes, 2013 Escape, Fusion, MKZ — Ford via NHTSA
  3. Hummer 3508C, SES light and reduced power with P0030 and others, H3 — Hummer via NHTSA
  4. Land Rover LTB01191NAS1, MIL with P0030-29 and P2251-13 stored, Land Rover — Land Rover via NHTSA
  5. Nissan NTB20-044, MIL on with A/F sensor 1 heater codes including P0030, Murano — Nissan via NHTSA
  6. Lincoln TSB-13-5-7, MIL with P0135, P0155 and possible P0030, Expedition and Navigator — Lincoln via NHTSA
Last reviewed
Written by
Saurabh K.
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