2021 Chevrolet Blazer Ignition Parts

This table covers the sensors that report camshaft position to the ECU. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor. Read more

23 Camshaft Position Sensor parts for the 2021 Chevrolet Blazer come from 10 brands — GM GENUINE, STANDARD MOTOR PRODUCTS, DELPHI and 7 other brands. The "Popular" part is GM GENUINE 12646782.

The Economy section lists 5 options from HOLSTEIN, PRENCO and UNITED MOTOR PRODUCTS — the catalog's value-priced group. HOLSTEIN 2CAM0408 is listed in this group.

In the Standard Replacement grade, GM GENUINE, STANDARD MOTOR PRODUCTS, ASTEMO / HITACHI and 4 other brands supply 12 parts: built to original-equipment specification. A representative part number is GM GENUINE 12646782.

6 further parts sit outside the graded sections, with the same engine-level match.

This table covers the seals at the Camshaft Position Sensor. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

2 Camshaft Position Sensor Seal parts are listed for the 2021 Chevrolet Blazer, from ELRING and GM GENUINE. 1 part fits every engine; the other 1 is engine-specific.

Listed part numbers: ELRING 048700 and GM GENUINE 12626252.

This table covers the sensors that report crankshaft position and engine speed. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor. Read more

21 Crankshaft Position Sensor parts for the 2021 Chevrolet Blazer come from 9 brands — SPECTRA PREMIUM, DELPHI, GM GENUINE and 6 other brands. The "Popular" part is DELPHI SS12172.

The Economy section: 6 options from SPECTRA PREMIUM, HOLSTEIN and DORMAN. DORMAN 962604 is listed in this group.

Standard Replacement: 15 parts, from DELPHI, GM GENUINE, STANDARD MOTOR PRODUCTS and 3 other brands. A representative part number is DELPHI SS12172.

This table covers the coils that fire each spark plug. Typical signs include a misfire that follows one cylinder, a snap in damp weather, or a coil that is swollen or cracked. Swap a suspect coil with a neighbor to confirm, then replace boots that tore on the way off. Read more

28 Ignition Coil parts for the 2021 Chevrolet Blazer come from 14 brands — DELPHI, GM GENUINE, STANDARD MOTOR PRODUCTS and 11 other brands. The "Popular" part is DELPHI GN10682. Economy, Premium and Standard Replacement are all represented, and Standard Replacement alone accounts for 15 parts.

This table covers the spark plugs for this engine. Typical signs include misfire under load, rough idle, or a flashing check-engine light. Verify the gap even on pre-gapped plugs, and replace coil boots that come off a high-mileage engine. Read more

21 Spark Plug parts are listed for the 2021 Chevrolet Blazer, from NGK, BOSCH, CHAMPION and 3 other brands. NGK 4344 carries the "Popular" badge.

In the Copper / Nickel grade, CHAMPION supplies 1 part: grouped under the catalog's "Copper / Nickel" designation — the notes column spells out what sets them apart. A representative part number is CHAMPION 570.

In the Double Platinum (lasts up to 3x longer than Copper / Nickel) grade, BOSCH supplies 1 part: grouped under the catalog's "Double Platinum (lasts up to 3x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is BOSCH 8107.

The Iridium (lasts up to 4x longer than Copper / Nickel) section lists 8 options from NGK, DENSO, ACDELCO and 3 other brands — grouped under the catalog's "Iridium (lasts up to 4x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. NGK 4344 is listed in this group.

In the Platinum (lasts up to 2x longer than Copper / Nickel) grade, NGK, BOSCH and CHAMPION supply 3 parts: grouped under the catalog's "Platinum (lasts up to 2x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is NGK 5019.

In the Ruthenium (maximum durability & ignitability) grade, NGK supplies 1 part: grouped under the catalog's "Ruthenium (maximum durability & ignitability)" designation — the notes column spells out what sets them apart. A representative part number is NGK 90220.

7 ungrouped parts are not assigned to a grade, with the same engine-level match.

This table covers the silicone and rubber boots that insulate the coil-to-plug spark path. Typical signs include a misfire in the rain, carbon tracking on the boot, or a snap when you pop the coil off. Replace boots as a set on a high-mileage engine; one cracked boot will take the coil with it. Read more

5 Spark Plug / Ignition Coil Boot parts for the 2021 Chevrolet Blazer come from 2 brands — STANDARD MOTOR PRODUCTS and GM GENUINE.

The Economy section: 2 options from STANDARD MOTOR PRODUCTS. STANDARD MOTOR PRODUCTS 20951 is listed in this group.

Standard Replacement: 2 parts, from STANDARD MOTOR PRODUCTS. A representative part number is STANDARD MOTOR PRODUCTS SPP190E.

1 further part sits outside the graded sections, with the same engine-level match.

Part numbers include STANDARD MOTOR PRODUCTS 20951, STANDARD MOTOR PRODUCTS 34181 and STANDARD MOTOR PRODUCTS SPP190E, among others listed above.

This table covers the seals at the Spark Plug Tube. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

4 Spark Plug Tube Seal parts for the 2021 Chevrolet Blazer come from 3 brands — MAHLE / CLEVITE, ELRING and GM GENUINE.

This group includes ELRING 912510, GM GENUINE 12613249 and MAHLE / CLEVITE GS34108 and the remaining parts above.