C0091 Trouble Code

View C0091 obd/2 error code description and symptoms. C0091 engine photo

Catalytic converters must be warm before they can work properly. On a cold start the PCM provides a rich mixture to keep the cold engine running.
All that extra fuel goes into the catalytic converter. But the exhaust isn't very hot, because, ah, the engine is pretty cold. GM has employed several strategies to fire up the catalytic converter quicker and reduce cold start emissions. One way is to use a secondary air pump that pumps outside air directly into the catalytic converter.

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code C0091, so consult the manual to locate the brake fluid reservoir. Bear in mind that a low fluid level can set code C0091 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.

Difficulty Level (Soso)
Level
Repair Time (50 Min.)
Time
Cost Prediction : $ 90-120

C0091 Error Code Repair Process :

The scent may C0091 signal oil or coolant leaking from their normally closed-loop systems, or it may indicate dangerous exhaust gases invading your car's interior. Car and truck exhaust contains toxic gases such C0091, so if the inside of your car lamp headlamp high-beam circuit open as if you were standing behind your car, get out and get it fixed. Fight the urge to take a little nap first. So sleepy. That's the carbon monoxide talking, friends. At least open a window on your way to the shop.

Wrench Tool C0091 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Common Causes of C0091

A common cause of code C0091 is the failure of Lamp Headlamp High-Beam Circuit Open, but there are several other possible causes as well, such as ;

C0091 code for all cars

You can view according C0091 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+C0091 American Gadabout +C0091 Azlk Moskvitch +C0091 Ferrari 126 +C0091 Ford Lynx +C0091 Daewoo Brougham

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

About Us | Contact | Privacy

Copyright 2017 © All rights reserved