Q: Replaced downstream o2 sensor, check engine light related to that sensor. What do i do?

asked by on May 08, 2017

Hi, i have a 2007 VW GTI 2.0T FSI motor. I have the check engine and comes up code p0036. Relating to the downstream o2 sensor, which i did replace and still the light came back. This car is modified with aftermarket cold air intake and APR tune. What should i do next? I need to pass emissions testing.

My car has 120921 miles.
My car has an automatic transmission.

P0036 refers to the heater circuit in the rear oxygen sensor. It can sometimes be solved by replacing the sensor itself, and other times the malfunction will be in the wiring to the sensor, the relay that controls the heater or the ECU itself. It takes some point to point work with a volt-ohm meter to sort out the trouble. You should first of all inspect the harness to the sensor to make sure it hasn’t been damaged and be sure that the exhaust system ground strap is in place. Beyond that my best recommendation is to contact Your Mechanic to have a technician come to your home or office and check out your sensor heater code and tell you what it will take to fix it.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Acceleration hesitation while climbing up sometime check engine light appear, high fuel consumption.

I would recommend checking the mass air flow sensor as this is a commonly known part that can cause this kind of loss of power. This regulates the air intake into the fuel injection and ensures a proper air/fuel mixture....

Engine died when I parked, as if it was turned off. It will turn over, but won't start. Could it be my MAF sensor?

Hi there. First check the transmission position sensor to see if the wiring harness has a short to ground or the sensor is failing. This sensor will cause the engine to shut off in the event that the computer...

P0234 code

Trouble code P0234 indicates the powertrain control module (PCM) senses a dangerously high boost pressure from the engine's forced induction system. Levels of boost in excess of recommended levels can compromise the structural integrity of the engine. If you need...

Related articles

P0594 OBD-II Trouble Code: Cruise Control Servo Control Circuit/Open
P0594 code means there is an malfunction in the electrical components of the cruise control servo circuit often due too liquid spills or blown fuses.
P0212 OBD-II Trouble Code: Injector Circuit Malfunction - Cylinder 12
P0212 P0212 code definition Injector Circuit Malfunction - Cylinder 12 What the P212 code means P0212 is telling us the Engine Control Module (ECM) has detected a fault within the cylinder 12 fuel injector circuit. This code is specifically...
P2219 OBD-II Trouble Code: NOx Sensor Heater Control Circuit Low Bank 2
P2219 code means there is an abnormal reading within the NOx sensor circuit voltage often due too faulty fuel usage or defective sensors.