P0154 Bank 2 upstream oxygen sensor not responding

Bank 2 upstream oxygen sensor not responding

Severity not verified — if the car runs badly, have it inspected

The sources describe the fault and its symptoms but do not give a driving-safety rating, so the severity is not verified.

Source: how we rate severity

P0154 in short

P0154 means the engine computer sees no signal activity from the Bank 2, Sensor 1 oxygen sensor, the upstream sensor on the side without cylinder 1. Likely causes are a failed sensor, damaged heater or signal wiring or a blown heater fuse. Poor fuel economy and rough running are common.

The upstream oxygen sensor tells the computer how rich or lean the exhaust is. P0154 is set when the Bank 2 Sensor 1 signal shows no activity at all.

The reference lists damaged wiring in the heater or signal circuits, a blown heater fuse, a defective sensor, contamination from silicone additives, internal engine problems and, rarely, the computer. Some Japanese makes use an air/fuel ratio sensor that is tested differently.

Most likely causes

These are general causes for this code across vehicles. None is specific to one make or model.

  1. Failed Bank 2 Sensor 1 oxygen sensor

    Common general cause
    Why it ranks here
    The sensor is the part whose signal is missing and the first cause listed.
    What would change this
    Rises if the sensor is discoloured or contaminated, or its heater fails a resistance check. Falls if wiring and fuse faults are found.
    How to test the oxygen (o2) sensor

  2. Damaged heater or signal wiring, or blown heater fuse

    Common general cause
    Why it ranks here
    A heater or signal circuit fault leaves the sensor with no output.
    What would change this
    Rises if a fuse is blown or a wire is chafed, or continuity fails. Falls if the circuits test good.

  3. Contaminated sensor (silicone additives, internal engine problem)

    Possible — needs testing
    Why it ranks here
    The reference lists silicone-based additives and internal engine faults as possible causes.
    What would change this
    Rises if the removed sensor shows deposits or discolouration. Falls if the sensor looks clean.

What to test first

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

  1. Record all stored codes and freeze-frame data, then inspect the Bank 2 Sensor 1 wiring and connector for damage.

    Low riskTool: scan tool

  2. Check the sensor heater and signal circuit resistance, voltage, ground and continuity against the vehicle manual.

    Best left to a shopTool: multimeter

    Warning:The exhaust is very hot after running and sensor connectors are easy to damage; let the engine cool and follow the wiring diagram.

Symptoms

  • Check engine light on
  • Hesitation, power loss or stalling
  • Increased fuel use
  • Black smoke or hard starting

How to fix

  1. Inspect the Bank 2 Sensor 1 wiring and connector for damage.

  2. Check the heater circuit fuse.

Parts and cost context

  • Oxygen (O2) sensor:Confirm the fault with testing before buying parts. 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

Chrysler

  • 2006 · PT Cruiser

    Supported by vehicle data

    NHTSA bulletin summary for this model: says P0154 can be reported in place of a different code. Whether it is still current is not verified.

  • 1801306Status unverified

    P0154 and other codes reported incorrectly (PT Cruiser)

    2006pt-cruiser · issued · NHTSA 10019942

    P2152, P0152, P0154, P0151, P0089, P0091 and P0092 are being reported incorrectly in place of P2149, P0132, P0131, P0087 and P0088. Only the NHTSA flat-file summary was read, not the bulletin itself.

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

Nissan

  • 2001–2002 · Frontier

    Supported by vehicle data

    NHTSA bulletin summary for this model: lists P0154 among several front and rear O2 sensor codes behind a MIL. Whether it is still current is not verified.

  • 2001–2002 · Xterra

    Supported by vehicle data

    NHTSA bulletin summary for this model: lists P0154 among several front and rear O2 sensor codes behind a MIL. Whether it is still current is not verified.

  • 2000–2001 · Maxima

    Supported by vehicle data

    NHTSA bulletin summary for this model: lists P0154 among front O2 sensor codes behind a MIL. Whether it is still current is not verified.

  • 04002AStatus unverified

    Front and rear O2 sensor codes including P0154 with the MIL on

    2001–2002frontier, xterra · issued · NHTSA 10005192

    MIL on with a group of front and rear O2 sensor codes that includes P0154. The summary says this bulletin replaced an earlier one dated 02/05/2004. Only the NHTSA flat-file summary was read, not the bulletin itself.

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

  • NTB02002Status unverified

    Front O2 sensor codes P0134, P0135, P0154 or P0155 with the MIL on

    2000–2001maxima · issued · NHTSA 629204

    MIL on with front O2 sensor codes P0134, P0135, P0154 or P0155. Only the NHTSA flat-file summary was read, not the bulletin itself.

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

Hyundai

  • 1999–2001 · Sonata

    Supported by vehicle data

    NHTSA bulletin summary for this model: lists P0154 among several O2 sensor codes behind a check engine light. Whether it is still current is not verified.

  • 2001 · Santa Fe

    Supported by vehicle data

    NHTSA bulletin summary for this model: lists P0154 among several O2 sensor codes behind a check engine light. Whether it is still current is not verified.

  • 0236010Status unverified

    Check engine light or O2 sensor codes including P0154 (Sonata)

    1999–2001sonata · issued · NHTSA 630852

    Check engine light or one of the codes P0133, P0134, P1134, P0153, P0154 or P1154. Only the NHTSA flat-file summary was read, not the bulletin itself.

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

  • 2336009Status unverified

    Check engine light or O2 sensor codes including P0154 (Santa Fe)

    2001santa-fe · issued · NHTSA 630854

    Check engine light or one of the codes P0133, P0134, P1134, P0153, P0154 or P1154. Only the NHTSA flat-file summary was read, not the bulletin itself.

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

  • P0155Heater circuit fault on the upstream oxygen sensor on the second bank of cylinders (bank 2, sensor 1)

    Other bank Possible — needs testing

    Bank 2 Sensor 1 neighbour code; read both when either is stored.

All Oxygen sensors codes

Sources and review

  1. P0154 trouble code — TroubleCodes.net
  2. P0154: NHTSA bulletin 10019942 (P0154 and other codes reported incorrectly (PT Cruiser)) — Manufacturer communication via NHTSA flat file
  3. P0154: NHTSA bulletin 10005192 (Front and rear O2 sensor codes including P0154 with the MIL on) — Manufacturer communication via NHTSA flat file
  4. P0154: NHTSA bulletin 630852 (Check engine light or O2 sensor codes including P0154 (Sonata)) — Manufacturer communication via NHTSA flat file
  5. P0154: NHTSA bulletin 630854 (Check engine light or O2 sensor codes including P0154 (Santa Fe)) — Manufacturer communication via NHTSA flat file
  6. P0154: NHTSA bulletin 629204 (Front O2 sensor codes P0134, P0135, P0154 or P0155 with the MIL on) — Manufacturer communication via NHTSA flat file
  7. On-Board Diagnostic Trouble Codes (generic code title list) — Delaware Division of Motor Vehicles
Last reviewed
Written by
Saurabh K.
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