Tech Tip: Park Avenue Lacks Power

Tech Tip: Park Avenue Lacks Power

Owners of 2000-2003 Buick Park Avenues may complain of a lack of power, hesitation, surge and/or possible DTC P0420. These symptoms may occur because the catalytic converter has degraded and will need to be replaced. DTC P0420 means the rear oxygen (O2) sensor has too much activity. This means it must be working and therefore the catalytic converter is bad and needs to be replaced ....

Vehicle: 2000-’03 Buick Park Avenue 3.8L

Symptom: Lack of power, hesitation, surge and/or possible DTC P0420.

Problem 1 of 3: The catalytic converter has degraded and will need to be replaced.

Test & Fix: DTC P0420 means the rear oxygen (O2) sensor has too much activity. This means it must be working and therefore the catalytic converter is bad and needs to be replaced. Be sure to perform test #3, which addresses a possible cause of the catalytic converter failure.

Problem 2 of 3: The catalytic converter is plugged.

Test & Fix: Check for back pressure at the front O2 sensor. If it is more than 1.25 psi at idle or at 2,500 rpm, replace the catalytic converter. Be sure to perform test #3, which addresses a possible cause of the catalytic converter failure.

Problem 3 of 3: Coolant leakage into the intake manifold causing catalytic converter failure.

Test & Fix: Inspect the intake manifold for signs of coolant. This engine is known for coolant leakage past the intermediate intake manifold gasket and the throttle body gasket. Replace the intermediate intake manifold gasket, the throttle body gasket and the throttle body nuts. Be sure to use medium-duty thread locker. The part number for the gasket kit is 17113137 and the nuts is 11517293.

Courtesy of IDENTIFIX.

For additional information, visit www.identifix.com.

You May Also Like

Non-Directional Rotor Finishes

Today, non-directional finishes on new brake rotors still serve the same purpose, but they also help in the bedding of some friction formulations.

Back in the day, a non-directional rotor finish was the method used to solve a common problem that occurred on bench brake lathes. If the crossfeed speed was too fast, the rotor became like a vinyl record, and the pads became the needle that followed the grooves in the record. This would cause a clicking noise as the pads moved in the caliper as it followed the concentric grooves.

PRT Launches 59 New Complete Strut Assemblies

Extending PRT’s product portfolio in North America, the new release represents nearly 12M vehicles in new coverage.

We Want Your Thoughts On Electronic Power Steering

Your opinion matters us and can be profitable for you too! Share your ideas with us.

Brake Problems

Reducing brake drag on late-model vehicles is not accomplished by a single component; it takes a system.

Ball Joint Wear

As the wear increases, play increases inside the joint. 

Other Posts

Clarios Formalizes Joint Development Agreement with Altris

Altris will develop sodium ion cells for low-voltage tech while Clarios will lead in battery management systems, software, and system integration for battery design.

Driveshaft Diagnostics

The big challenge with late-model vehicles is the diversity of driveshafts. 

AMN Drivetime: Cal Ganda’s Continental Journey

Ganda embodies servitude leadership, prioritizing team success and customer-centricity.

Eli Opens Reservations for its Micro-EV in the US

The new Eli ZERO represents a new category of high-tech, efficient and sustainable micro-EVs, according to Eli Electric Vehicles.