Q: Would leaking exhaust manifold throw a code?

asked by on

I have a pretty bad exhaust manifold gasket leak and im getting the code for bad catalyst sensor bank 2. I was wondering if my catalytic converters are bad or if its the exhaust leak that's throwing the code? Also when accelerating my truck bogs and doesnt run good at all.

My car has 139000 miles.
My car has an automatic transmission.

If the exhaust system is not air tight, that will skew oxygen sensor readings and a consequence is a false indication of catalyst efficiency. In addition, the upstream sensor will not be providing a valid reading to the computer insofar as combustion conditions. The invalid inputs to the computer could be a part explanation of the poor performance. Your best course is to fix the manifold leak first and then re-evaluate the engine performance. It may be that additional issues exist but a leaking manifold is going to needlessly complicate the diagnosis. To have the manifold replaced on a mobile basis, right at your location, please request exhaust manifold replacement service. Once that repair is complete, the very same mechanic can perform any additional required diagnostics and thence repairs.

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
  1. Home
  2. Questions
  3. Would leaking exhaust manifold throw a code?

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

Q: Is shaking above 45 MPH signs of failing torque converter?

A shake at higher speeds can be caused by numerous different things. This could be caused by your engine running badly, out of balance wheel, or even loose suspension components. My best recommendation would be to have your entire vehicle...

Q: My car stalls out as soon as I started and there's a little red light flashing where the gas gauge is in my 2007 Dodge Charger

Hey there. This sounds like an anti-theft issue which could also be related to the chip in your key not being properly read by the car's computer. I would suggest taking it to the dealer and seeing if they can...

Q: Oxygen sensor all over the place with readings

Oxygen sensors that are in-line after the catalytic converter (i.e., downstream sensors) should output a relatively steady voltage. The purpose of the downstream oxygen sensor is to monitor the efficiency of the converter rather than provide feedback to the the...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.