Walker Products 350-33038 oxygen sensor for the 1985-1989 Volkswagen Jetta 4-cylinder 1.8L, the 1990-1992 Jetta 4-cylinder 2.0L and other vehicles measures the oxygen in the exhaust gas so the engine computer can judge combustion. This upstream sensor is a narrow-band, 3-wire design that gives the ECU the diagnostic feedback it expects for its application and position.
A rough-running engine, rising fuel use, higher exhaust emissions or a lit malfunction indicator light can point to a worn sensor. A damaged wiring harness or connector can be behind those signs too, so look both over for physical damage with the engine off before you replace the sensor.
The 1990 Volkswagen Passat 4-cylinder 2.0L, the 1985-1989 Golf 4-cylinder 1.8L and the 1990-1992 Golf 4-cylinder 2.0L are among the vehicles this direct-fit oxygen sensor fits, along with many others. The fitment calls for one upstream sensor per vehicle, and this listing is a single sensor.
Fit and size
Build and materials
Is this the right oxygen sensor for a 1985-1989 VW Jetta 4-cylinder 1.8L?
Yes. Walker Products 350-33038 is the upstream sensor for the 1985-1989 Volkswagen Jetta 4-cylinder 1.8L and the 1990-1992 Jetta 4-cylinder 2.0L. If your car is not named here, check it on the Buyer's Guide tab.
Is this the VW Golf oxygen sensor for a 1990-1992 Golf 4-cylinder 2.0L?
Yes. Walker Products 350-33038 is listed for the 1990-1992 Volkswagen Golf 4-cylinder 2.0L and the 1985-1989 Golf 4-cylinder 1.8L, each as the upstream sensor.
Is this Walker Products oxygen sensor a narrow-band type?
Yes. This sensor is a narrow-band, 3-wire design made for the upstream position.
Do the electrodes on this oxygen sensor have a protective coating?
Yes. The electrodes are made of a gas-permeable platinum layer, and a coating protects the electrode surfaces from contamination and erosion by combustion residue and particulates in the exhaust gases.
Will a worn oxygen sensor set a fault code?
Newer vehicles store fault codes in the ECU, and some relate to the affected sensor and its associated systems. A shop can read them to help find the cause.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
