The Quick Answer above is the generic definition. What follows is the model-specific detail for the Volkswagen models that log P0133.
DTC/P0133·Volkswagen
P0133 on Volkswagen: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Volkswagen
P0133 on a Volkswagen means the upstream oxygen sensor on bank 1 (before the catalytic converter) still produces a signal, but it reacts too slowly when the mixture changes. The engine computer times how quickly the sensor follows its own rich and lean fuel corrections and sets the code when the response is too sluggish. An aged or contaminated sensor is the usual cause, but an exhaust leak, an intake air leak or a weak sensor heater can produce the same result. VW, Audi, Skoda and SEAT apps often show this code as P013300; the last two digits are a failure-type byte.
Typical repair cost, all makes€45 - €400
Connect any standard Bluetooth OBD2 adapter to your Volkswagen and Skanyx tells you what P0133 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.
Get Skanyx freeWhat does P0133 mean on a Volkswagen?
Volkswagen Golf
2005-2024On VW group cars VCDS shows P0133 as 16517, 'Oxygen (Lambda) Sensor B1 S1: Response too Slow'. Besides an aged or faulty sensor before the catalytic converter, the listed causes include exhaust leaks ahead of that sensor, unmetered air from intake or PCV leaks, and contamination by silicone, coolant or leaded additives, so check for leaks before fitting a new sensor.
What causes P0133 on a Volkswagen?
Beyond the generic causes listed on the main P0133 page, these are the patterns noted for Volkswagen models:
Volkswagen GolfUnmetered air from intake or PCV leaks upsetting lambda control
Volkswagen GolfExhaust leak ahead of the pre-catalyst oxygen sensor
How to diagnose P0133 on a Volkswagen with OBD2
Follow these steps to pinpoint the root cause of P0133:
- Read every stored code and the freeze frame. Fix lean or rich fuel trim codes, misfires, MAF faults and oxygen sensor heater codes first, because each of them can make a healthy sensor look slow
- Find out whether your engine has a narrowband or a wideband (air-fuel ratio) sensor in this position, because the two behave very differently on a scan tool
- On a narrowband sensor, hold a fully warm engine at 2,000 to 2,500 rpm and watch the signal. It should swing several times a second between below 0.2 V and above 0.8 V, with quick transitions. A lazy, rounded wave with few swings fits P0133. A generic OBD2 reader samples too slowly to judge switching speed precisely, so treat what you see as a rough guide; a lab scope or the manufacturer's software shows it properly
- On a wideband sensor, snap the throttle open and closed on a warm engine and watch the lambda value: it should move promptly toward rich and then lean. A reading that drifts slowly back to 1.00 supports a slow sensor
- Check for exhaust leaks ahead of the sensor (ticking at the manifold on a cold start, soot trails at the gasket) and for intake leaks with a smoke test, including the PCV valve and its hoses
- Check the sensor heater: the fuse, the heater resistance across the heater pins with the sensor unplugged, and the heater feed voltage with the key on
- If everything else checks out, replace the sensor with one that matches the original part number, clear the code and drive a full warm-up cycle. The oxygen sensor monitor result appears in the readiness status, and on many cars in the Mode 06 test results, once it has run
How much does P0133 cost to fix on a Volkswagen? (EUR)
Estimated repair costs for P0133 in EUR, compiled across makes. Expect Volkswagen parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0133
These codes are often seen alongside P0133 or point to related issues, on any make:
Looking for the full P0133 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0133 guideSkanyx · Volkswagen
Diagnose P0133 on your Volkswagen
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