1998 Pontiac Bonneville Engine And Engine Cooling:exhaust System:manifold/header/muffler/tail Pipe Problems

NHTSA component category: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE · data through 07/14/2026

47Engine And Engine Cooling:exhaust System:manifold/header/muffler/tail Pipe complaints

17%Of all 277 complaints

#2Most-reported category

Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.

How engine and engine cooling:exhaust system:manifold/header/muffler/tail pipe ranks on this vehicle

ENGINE AND ENGINE COOLING:ENGINE:GASOLINE52 · 18.8%

ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE47 · 17%

ENGINE AND ENGINE COOLING45 · 16.2%

ENGINE AND ENGINE COOLING:ENGINE34 · 12.3%

ENGINE AND ENGINE COOLING:COOLING SYSTEM25 · 9%

Share of the 277 complaints citing each category; one complaint can cite several. Full breakdown on the 1998 Pontiac Bonneville overview page.

What owners report

“CONSUMER CALLED COMPLAINING ABOUT HAVING PROBLEMS WITH THE INTAKE MANIFOLD. ALSO STATED THAT WHILE DRIVING THE VEHICLE THE ENGINE WILL OVERHEAT. DEALER WAS CONTACTED AND…”NHTSA complaint 10004359 — filed 01/22/2003

“CONSUMER WAS ADVISED THE ENGINE FAILED DUE TO A DESIGN PROBLEM OF THE INTAKE MANIFOLD. THE TOP OF INTAKE MANIFOLD WAS PLASTIC AND HAD A…”NHTSA complaint 10002585 — filed 01/13/2003

“CONSUMER STATES THE PLASTIC INTAKE MANIFOLD CRACKED, CAUSING ENGINE TO HYDROLOCK AND BENDING 5 PUSH RODS. THIS ALLOWING COOLANT TO ENTER ENGINE CAUSING MAJOR DAMAGE…”NHTSA complaint 10001343 — filed 12/20/2002

Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.

Engine And Engine Cooling:exhaust System:manifold/header/muffler/tail Pipe complaints by year filed

Frequently asked questions

Does the 1998 Pontiac Bonneville have engine and engine cooling:exhaust system:manifold/header/muffler/tail pipe problems?

Engine And Engine Cooling:exhaust System:manifold/header/muffler/tail Pipe is the #2 most-reported problem area on the 1998 Pontiac Bonneville: 47 of 277 complaints on file (17%). Complaints are unverified owner reports, not confirmed defects.

How many complaints does the 1998 Pontiac Bonneville have in total?

277 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 9 involved a crash, 28 involved a fire, 7 reported injuries, and none reported deaths.

What does NHTSA's engine and engine cooling:exhaust system:manifold/header/muffler/tail pipe category include?

NHTSA assigns each complaint to standard component categories; this page reports the ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE category exactly as NHTSA defines and records it.

About this data — Complaint figures on this page are consumer reports submitted to the National Highway Traffic Safety Administration (NHTSA), a U.S. government agency. NHTSA does not verify individual complaints; a complaint is not proof that a defect exists, and counts reflect what owners chose to report, not confirmed failure rates. Recall information comes from official NHTSA safety recall campaigns; recall repairs are free at authorized dealers. Always check your specific vehicle by VIN at nhtsa.gov/recalls. CarModelProblems.com is an independent site and is not affiliated with NHTSA or any vehicle manufacturer. Data through 07/14/2026.