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DTC codes / Volkswagen codes / P1113

P1113 · VolkswagenOxygen Sensor Heater Resistance Too High Bank 1 Sensor 1

P1113 on Volkswagen vehicles means the engine control module (ECM) measured a heater circuit resistance for the upstream oxygen sensor on bank 1 that is higher than the expected range, indicating a weak or open heater element or a wiring fault. The sensor's heater is responsible for bringing the sensor up to operating temperature quickly so the ECM can enter closed-loop fuel control; when resistance is too high, the heater draws too little current and the sensor may stay cold longer than intended.

SystemPowertrain
Code typeVolkswagen specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Slightly longer time before the engine enters closed-loop fuel control when cold, which may cause a brief rich-running smell
  • Occasional rough idle or hesitation during the first minute or two after a cold start
  • A small increase in fuel consumption, especially on short trips where the sensor never fully warms
  • In some cases, a stored pending code or a freeze-frame showing low heater current without a driveability complaint

Common causes, most likely first

  1. Failed oxygen sensor heater element (open circuit or high internal resistance) inside the bank 1 sensor 1 assembly
  2. Corroded, loose, or damaged electrical connector at the oxygen sensor, causing high resistance in the heater circuit
  3. Broken or chafed heater power or ground wire between the ECM and the oxygen sensor
  4. High-resistance connection at the ECM harness connector or a faulty ECM driver for the heater circuit
  5. Aftermarket oxygen sensor with an incorrect heater resistance specification fitted previously
  6. Moisture intrusion into the sensor connector or wiring harness causing corrosion and increased resistance

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data, then clear the code and verify whether P1113 returns after a cold start and a short drive
  2. Visually inspect the bank 1 sensor 1 connector and harness for corrosion, chafing, or loose pins, and check the heater circuit resistance at the sensor connector with a multimeter
  3. Measure heater supply voltage and ground continuity from the ECM side of the connector to confirm the wiring is intact before condemning the sensor
  4. Compare the measured heater resistance against the Volkswagen specification for the fitted sensor; replace the oxygen sensor if resistance is out of range or open
  5. If wiring resistance is high, repair or replace the affected section of the heater circuit and re-test
  6. After repair, clear codes, perform a cold-start drive cycle, and confirm the heater circuit current and oxygen sensor readiness monitor set correctly

Why a new sensor may not fix P1113

  • A common misdiagnosis is replacing the oxygen sensor without checking the heater circuit wiring; corroded pins or a chafed wire can mimic a failed heater and the new sensor will set the same code immediately.
  • Volkswagen oxygen sensor heater resistance specifications vary by engine code and sensor part number, so comparing against a generic value can lead to replacing a good sensor.
  • The ECM may set P1113 based on a calculated resistance from heater current rather than a direct resistance measurement, so a weak battery or poor ground can skew the reading and trigger the code.
  • On some Volkswagen engines, the oxygen sensor heater shares a ground path with other components, and a bad ground elsewhere can raise the measured resistance without any fault in the sensor itself.
  • P1113 can appear alongside mixture adaptation codes when a slow heater keeps the sensor cold, so always check for related fuel trim codes before assuming the heater is the only problem.

Can I keep driving with P1113?

The vehicle remains safe to drive because the heater fault does not affect braking or steering, but prolonged driving with a cold sensor can increase fuel consumption and emissions. Avoid extended short-trip driving and have the fault diagnosed soon, especially if the check engine light flashes or other codes appear.

Tools that help

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Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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