Q: Car starts with difficulty, ABS and O2 sensor lights on

asked by on September 13, 2016

The car has difficulty starting up. It takes a while to turn over. Also, the dashboard is showing the ABS light illuminated along with the Oxygen sensor light. I have recently replaced the oxygen sensor. What could be the problem?

Hello. The hard start and O2 sensor light can be due to the fuel control distributor leaking excessive amounts of fuel from the air control door. Some leakage is normal but less that 22cc of fuel and anymore than this can cause hard starting and O2 sensor erratic readings. The ABS system will have to be tested to see why the light is on. Check for fluid level and brake light operation. You may have a bad speed sensor. If you would like to have this checked for you, a qualified professional from YourMechanic can diagnose the hard start and warning lights for you.

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

My car periodically won't start - 2005 Toyota Tacoma

Hello. I would need to know if the vehicle has an automatic or manual transmission. If it has a manual, it is typically caused by a bad clutch pedal switch. This closes the circuit for the starter when the clutch...

Car won't start - 2006 Mercedes E350

One common issue that occurs when the battery cables are not removed while doing service on ABS brake systems is that it may trigger a few error codes to be stored in the ECU after removing the calipers. In most...

Car won't crank or start

Hello. If the engine will not try to turn over at all then the power to the start needs to be checked. If there is power to the starter and it is just not turning the engine then there may...

Related articles

A Buyer’s Guide to the 2012 Mercedes-Benz SLK
It’s It’s not a sedan and it’s not quite a sports car, but chances are that brand-loyal fans desiring that luxury-class hard-top convertible with some oomph under the hood won’t care. The SLK roadster boasts three attractive engine options, and...
How Are Sensors Used to Improve a Car’s Performance?
Modern vehicles utilize a series of car sensors to improve performance and reduce emissions. The oxygen sensor helps reduce tailpipe emissions.
What Does the ABS Warning Light Mean?
The ABS light comes on due to anti-lock braking system issues. Causes include low brake fluid, a blown fuse, or abnormal signals from wheel sensors.