{"nhtsa_id":37961,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1995-02-09","date":"1994-12-01","document_id":"CAMP/90C51","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL","mfr_system":null,"summary":"THE ADMINISTRATOR OF THE US ENVIRONMENTAL PROTECTION AGENCY (EPA) AND GENERAL MOTORS HAVE DETERMINED THAT CERTAIN 1990 GEO METRO VEHICLES WITH 1.0L ENGINES MAY EXCEED HIGH ALTITUDE CARBON MONOXIDE FEDERAL EMISSION STANDARDS. THIS CONDITION APPLIES TO VEHICLES REGISTERED IN COLORADO, NEVADA NEW MEXICO AND UTAH (VEHICLES WHICH HAVE MOVED TO THES STATES FROM CALIFORNIA WHICH ARE EQUIPPED WITH RPO YF5 DO NOT REQUIRE THIS CAMPAIGN REPAIR). THESE STANDARDS WERE ESTABLISHED TO PROTECT THE THE PUBLIC HEALTH AND WELFARE FROM DANGERS OF AIR POLLUTION. EXCESS EMISSION OF POLLUTANTS MAY CAUSE A VEHICLE TO FAIL STATE MANDATED EMISSION TESTS. TO CORRECT THIS CONDITION, VEHICLES REGISTERED IN THE FOUR AFFECTED STATES WILL HAVE A REDESIGNED OXYGEN SENSOR INSTALLED. *TW","document":null,"url":"https://open.wenmarpro.com/bulletins/37961","components":[{"id":"engine","name":"Engine","parent":null},{"id":"exhaust-emissions","name":"Exhaust and emissions","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"GEO","model":"METRO","year_from":1990,"year_to":1990,"match":"exact","vehicle_ids":["1990_geo_metro"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}