P0132 Front oxygen sensor signal too high (bank 1, sensor 1)

O2 sensor circuit high voltage, bank 1 sensor 1

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The code relates to emissions feedback rather than engine function, and TroubleCodes.net says most vehicles show only the check engine light, so you can usually drive while you book a check.

It gets more serious if:

  • Inspect soon: Inspect soon if the car also loses power, hesitates or runs rough. A Mazda CX-9 owner reported P0132 on the same day the car would not accelerate.

Source: how we rate severity

P0132 in short

P0132 means the front oxygen sensor on bank 1 is sending a voltage higher than it can normally produce. A failed sensor is the most common cause, followed by a short or damaged wiring. It rarely changes how the car drives, so you can usually drive while arranging a check.

The front oxygen sensor reports how rich or lean the exhaust is, and the computer uses it to trim fuel. Its signal normally swings through a middle range. If the computer sees a voltage above the highest value a working sensor produces, it sets P0132.

A sensor that has aged out is the usual explanation, with a wiring short to a power wire, a damaged or wet connector and, rarely, the computer behind it. TroubleCodes.net says to rule out circuit problems before condemning the sensor.

Manufacturers have also issued bulletins naming the code among others. Ram's 2010 to 2012 diesel bulletin replaces oxygen sensor connectors for any O2-sensor code, and Ford, Nissan and Chrysler bulletins list P0132 with other codes without the NHTSA summary giving a repair.

Most likely causes

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

  1. Front oxygen sensor worn out or failed

    Common general cause
    Why it ranks here
    TroubleCodes.net calls a faulty sensor the most frequent cause, since sensors typically last under five years. An owner of a Dodge Caliber had the code read as the sensor failing.
    What would change this
    Rises if the sensor wiring tests good and the sensor does not respond to a mixture change. Falls if the circuit shows a short to voltage.
    How to test the oxygen (o2) sensor

  2. Short to voltage, damaged harness or corroded connector

    Common general cause
    Why it ranks here
    TroubleCodes.net lists a short to positive, damaged harness, corrosion and water entry. Ram's diesel bulletin replaces oxygen sensor connectors for any O2-sensor code on 2010 to 2012 trucks.
    What would change this
    Rises if the connector is damaged or wet or the signal wire reads voltage with the sensor unplugged. Falls if wiring tests good.

  3. Engine computer fault (rare)

    Possible — needs testing
    Why it ranks here
    TroubleCodes.net lists the engine computer as uncommon. Chrysler's 2002 bulletin on erroneous O2 codes suggests a computer or software fault can set the code without a real sensor problem, but the summary does not say so.
    What would change this
    Rises if sensor, wiring and connector all test good. Falls if any of them is faulty.
    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 stored codes and freeze-frame data, including any other oxygen sensor, heater or fuel trim codes.

    Low riskTool: OBD-II scan tool

    • IfOther O2 sensor or heater codes are stored on the same bank

      It meansCheck the wiring and connectors for a shared fault.

      Go to step 2

    • IfP0132 is the only code

      It meansInspect the sensor and wiring.

      Go to step 2

  2. With the engine off and cool, inspect the oxygen sensor wiring, connector and the exhaust nearby for damage, corrosion, water or a melted wire.

    Use caution

    Warning:The exhaust gets very hot. Let it cool fully before touching the sensor or pipes.

  3. Check the sensor signal circuit for continuity and for a short to voltage, then watch the sensor reading with a scan tool.

    Best left to a shopTool: digital multimeter, scan tool with live data

    Warning:Needs a professional shop with the right scan tool and wiring diagrams; do not guess at this step.

Symptoms

  • Check engine light on, usually with no change in how the car drives
  • Sometimes slightly worse fuel economy
  • Hesitation or loss of power in a few reports Gets more serious: stop and have it checked.

How to fix

  1. With the engine off and cool, look at the oxygen sensor wire and connector for melted insulation, corrosion or a loose plug.

Parts and cost context

  • Oxygen (O2) sensor:Check the wiring before buying a sensor; a bad connector or shorted wire can set the same code. Labor 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

Dodge

  • 2010–2012 · Ram

    Supported by vehicle data

    Chrysler bulletin 25-004-12 replaces the oxygen sensor connectors on 2010 to 2012 Ram 2500 pickup/3500 diesels for any O2-sensor code before parts are replaced; the same bulletin applies to the 3500. Whether it is still current is not verified.

  • 25-004-12Status unverified

    MIL due to oxygen sensor

    2010–2012ram · NHTSA 10128943

    Replaces the oxygen sensor connectors for any O2-sensor code on diesel trucks, after the verification test and before replacing any parts.

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

Ford

  • 2013 · Escape

    Possible — needs testing

    Ford bulletin TSB-14-0129 lists P0132 with P0135, P0030, P2243 and P2251 on the 2013 Escape. The NHTSA summary does not state the repair.

  • TSB-14-0129Status unverified

    P0132, P0135, P0030, P2243, P2251 stored

    2013escape, fusion · NHTSA 10056662

    NHTSA summary lists the codes that set the MIL on 2013 Escape, Fusion and MKZ; it does not give the repair.

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

Mazda

  • 2016 · CX-9

    Possible — needs testing

    One owner reports P0132 with a sudden loss of acceleration; the light went out after an hour. A single complaint.

  • P0131The engine computer sees a voltage that is too low on the upstream oxygen sensor circuit for bank 1

    Shares causes Possible — needs testing

    Chrysler's 2002 bulletin on erroneous O2-sensor codes lists P0131 with P0132, so low and high readings from the same sensor can come from one fault.

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

    Shares causes Possible — needs testing

    Ford's 2013 Escape, Fusion and MKZ bulletin lists P0132 together with P0135 (heater circuit).

All Oxygen sensors codes

P0132 questions

Can I drive with P0132?

Usually, since most cars show only the light. Get it checked if the car also hesitates or loses power.

Should I just replace the oxygen sensor?

A failed sensor is the most common cause, but TroubleCodes.net says to rule out wiring and connectors first. A bad connector can set the same code.

Sources and review

  1. P0132 oxygen sensor circuit high voltage, bank 1 sensor 1 — TroubleCodes.net
  2. NHTSA complaint ODI 11472060, 2016 Mazda CX-9: P0132 stored when the car would not accelerate; light went out after an hour — NHTSA
  3. NHTSA complaint ODI 10424604, 2008 Dodge Caliber: P0132 read at a parts store and attributed to the oxygen sensor — NHTSA
  4. Chrysler bulletin 25-004-12: replace the oxygen sensor connectors for any O2-sensor DTC on 2010-2012 Ram 2500/3500 diesels; do not replace parts first — Chrysler
  5. Chrysler bulletin 1803102: erroneous O2-sensor DTCs including P0132 on 2002 300M, Concorde and Intrepid — Chrysler
  6. Ford bulletin TSB-14-0129: P0132, P0135, P0030, P2243 and P2251 stored on 2013 Escape, Fusion and MKZ — Ford
Last reviewed
Written by
Saurabh K.
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