The Quick Answer above is the generic definition. What follows is the model-specific detail for the Porsche models that log P0150.
DTC/P0150·Porsche
P0150 on Porsche: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Porsche
P0150 on a Porsche means the engine computer is getting an implausible or out-of-range signal from the upstream oxygen sensor on bank 2, the sensor before the catalytic converter on the half of the engine that does not contain cylinder 1. Bank 2 exists on most V6, V8 and flat-six engines and on a few inline-sixes whose exhaust is split into two halves, such as BMW's M54. It is the same fault as P0130, just on the other side of the engine, and the cause is usually the sensor itself or its wiring and plug.
Typical repair cost, all makes€45 - €560
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Porsche Boxster (986)
1996-2004The 986 Boxster's flat-six has four oxygen sensors: one before and one after the catalytic converter for bank 1 (cylinders 1-3) and the same pair for bank 2 (cylinders 4-6). All four are listed as the same part and fully interchangeable on this car, so swapping the two pre-cat sensors is a free test: if the fault moves to P0130, the sensor is bad; if P0150 stays, look at the bank 2 wiring. When P0130 and P0150 appear together after a sensor change, check the wiring first and use direct-fit sensors with factory-crimped plugs rather than universal splice-in sensors.
What causes P0150 on a Porsche?
Beyond the generic causes listed on the main P0150 page, these are the patterns noted for Porsche models:
Porsche Boxster (986)Failed bank 2 (cylinders 4-6) pre-cat sensor
Porsche Boxster (986)Wiring or plug fault, especially when P0150 appears together with P0130 after universal sensors were spliced in
How to diagnose P0150 on a Porsche with OBD2
Follow these steps to pinpoint the root cause of P0150:
- Read all stored codes and the freeze frame. Note whether bank 1 sensor codes (P0130-P0135) or other bank 2 codes (P0151-P0155, P0174) are stored too. Faults on both banks at once point to something they share, such as a fuse, a ground or a fuel or air problem, rather than one bad sensor
- Find out which physical side is bank 2 on your engine. It is the bank without cylinder 1, but makers place cylinder 1 on different sides, so check the service information instead of guessing
- Warm the engine fully and watch the Bank 2 Sensor 1 and Bank 1 Sensor 1 readings side by side on a scan tool. A healthy narrowband sensor switches between about 0.1 and 0.9 volts several times a second at 2000 rpm. If bank 1 switches and bank 2 is flat, missing or pinned, the problem is on the bank 2 side. Wideband sensors show lambda or current instead of a switching voltage, so compare bank 2 against bank 1
- Inspect the bank 2 sensor connector and wiring along its full run for corrosion, melted insulation, pushed-back pins and chafing against the exhaust or heat shields
- With the key on and engine off, back-probe the harness plug: confirm battery voltage on the heater feed, a good ground, and continuity of the signal wire back to the engine computer using the wiring diagram
- Check for exhaust leaks ahead of the sensor. A ticking noise on a cold start that fades as the engine warms often means a leaking manifold gasket or a cracked manifold
- If the wiring and exhaust are sound, fit a direct-fit sensor with the correct plug, clear the code and complete a drive cycle to confirm it stays off
How much does P0150 cost to fix on a Porsche? (EUR)
Estimated repair costs for P0150 in EUR, compiled across makes. Expect Porsche 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 P0150
These codes are often seen alongside P0150 or point to related issues, on any make:
Looking for the full P0150 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0150 guideSkanyx · Porsche
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