Q: Oxygen sensor bank 1 sensor 1

asked by on July 20, 2017

Oxygen sensor bank 1 sensor no access on 2003 grand marquis Cant barely fit my hand or any tools to remove and replace sensor the catalytic conver is just in the way

My car has 140000 miles.
My car has an automatic transmission.

Hi there. Getting to the O2 sensors are tricky without removing some additional components or using specialty tools. You might want to have a professional mobile mechanic come to your location and complete an O2 sensor replacement to help you. However, in many cases, what is commonly diagnosed as an O2 sensor problem is actually the electrical harness that connects the sensor to the ECU or other component. It might be best to replace the harness and sensor.

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

Humming noise, wheel bearing issue, and two evap leaks

Regarding the right, front wheel bearing, you can confirm this diagnosis by turning left at moderate speeds (i.e. freeway on-ramp). The noise will increase during the turn (which loads the right front wheel bearings). Regarding the squeal while turning...

I just replaced my intake manifold , and my car is still shaking and won't accelerate quite right what should I do?

It sounds like you have a misfire. This can be caused by many things: a vacuum leak, ignition component failure, fuel system issues, etc. With a misfire, typically the Check Engine Light comes on to indicate that a trouble...

Car stalling at average speeds, no engine codes

A faulty air mass meter could cause drivability issues and not throw a code right away. The air mass meter is one of the sensors that help sets base injection timing. If the sensor is reading correctly but is within...

Related articles

Understanding the Mercury Intelligent Oil Life Monitor and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Mercury Intelligent Oil Life Monitor indicates when and what service your car needs.
Mercury Certified Pre-Owned (CPO) Car Program
Drivers Drivers who are shopping around for a used Mercury vehicle may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on to...
Symptoms of a Bad or Failing ABS Control Module
Common signs include an unresponsive brake pedal, the ABS Light coming on, and brakes locking up.