Check engine light flashing in Chico CA? Active misfire — pull over now. Ignition coil, spark plug, injector causes. $199.99/hr diagnosis. (530) 826-4275.
A flashing check engine light means an active misfire is destroying your catalytic converter right now. Pull over, reduce speed, call us. A $180 ignition coil repair versus a $1,200 catalytic converter replacement — the difference is whether you stop driving.
A flashing check engine light is a driving emergency. It means the ECU detected an active misfire severe enough to overheat and destroy your catalytic converter within miles. The most common cause in Chico is a failed ignition coil — $80–$180 to replace. A catalytic converter is $600–$1,800. Pull over, reduce speed, call us at (530) 826-4275. Do not continue highway driving. A steady (non-flashing) CEL is much less urgent but should still be diagnosed within a few days.
A flashing (blinking) check engine light means an active misfire severe enough to damage your catalytic converter — potentially within miles of continued driving. The ECU is detecting unburned fuel entering the exhaust, which overheats and destroys the catalyst.
A catalytic converter costs $600–$1,800. An ignition coil costs $80–$180. The difference between those two repairs is whether you keep driving.
What to do: Reduce speed, avoid hard acceleration, find a safe place to stop. Call us at (530) 826-4275. Do not continue highway driving.
A steady (non-flashing) check engine light means a fault was detected and stored — but it's not an active, immediate emergency. You can usually drive short distances to get to us safely, but don't ignore it for weeks.
A steady CEL that gets ignored long enough can turn into a flashing CEL — or cause secondary damage to other components.
Each cylinder has its own coil-on-plug ignition coil on most modern vehicles. When a coil fails, that cylinder misfires on every power stroke — raw fuel enters the exhaust and the catalytic converter overheats instantly. Chico heat cycling is hard on coil boots and coil internals. A failed coil is the #1 cause of a flashing CEL in Chico.
Coil replacement: $80–$180 per coil. Diagnose which cylinder before replacing.
A spark plug that won't fire — fouled with carbon, oil-contaminated, or simply worn out — causes the same cylinder misfire pattern as a bad coil. We test coils and plugs individually to identify the actual failed component before replacing multiple parts.
Plug replacement quoted by vehicle
A fuel injector that won't open starves that cylinder of fuel — no combustion, misfire. A fuel injector stuck open floods the cylinder with fuel — raw fuel into the exhaust, same catalytic converter damage. Injector failure is less common than coil failure but causes the same flashing CEL.
Low compression from a failed head gasket, worn piston rings, or a burnt valve can cause a persistent misfire that won't respond to ignition and fuel system repairs. This is the most serious cause of a flashing CEL — it means the cylinder can't generate power regardless of ignition and fuel quality.
We read misfire counts per cylinder from the ECU's live data — this tells us exactly which cylinder is misfiring, how often, and under what conditions. P0301–P0308 are cylinder-specific misfire codes. P0300 is random misfire across multiple cylinders.
We swap the coil from the misfiring cylinder to a known-good cylinder and retest. If the misfire follows the coil, the coil is bad. If it stays on the original cylinder, the plug or injector is the issue. This one test eliminates 80% of misfire guesswork.
If coil, plug, and injector testing doesn't find the fault, we run a compression test on the misfiring cylinder. Low compression means a mechanical cause — head gasket, piston rings, or valve — which requires a very different repair.
Pull over safely as soon as possible. Reduce speed and avoid hard acceleration if you must continue briefly to reach a safe stopping point. Turn off the AC to reduce engine load. Call us at (530) 826-4275. A flashing CEL means active catalytic converter damage is occurring — every mile matters.
Flashing = active misfire causing catalytic converter damage — pull over now. Steady = a fault detected and stored — safe for short distances but diagnose within a few days. Never ignore either one long-term.
$199.99/hr with a written report after the first hour. We identify the misfiring cylinder, test coil and plug, run injector contribution testing, and compression test if needed. diagnostic scan pulls the specific P-codes before we start the diagnostic process.
Only if home is very close — a few miles at most, at reduced speed, avoiding the freeway. Every mile of misfiring on the freeway destroys the catalytic converter more. If you're more than a few miles from home, it's worth the cost of a tow to avoid a $1,200+ catalytic converter replacement.
The active misfire may have resolved on its own — or it's intermittent. The damage to the catalytic converter may have already occurred. Come in for a diagnosis — we'll check misfire history, catalyst efficiency codes, and verify the converter wasn't damaged.
digital inspection when performed · $199.99/hr written diagnosis
📍 2695 CA-32, Chico, CA 95973 · Open Mon–Fri 7AM–6PM · Sat 8AM–5PM · Sun 9AM–5PM · Open 7 Days
2695 CA-32, Chico · (530) 826-4275
Buddy Rausch founded Tedious Auto Repair in Chico, CA in 2007 and has been serving Butte County for 18+ years. Buddy oversees shop standards and quality control. All content on this page reflects real procedures, OEM specifications, and cases seen in the shop. About Buddy Rausch, ASE-Certified →
Buddy Rausch founded Tedious Auto Repair in Chico, CA in 2007. ASE-Certified. 18+ years serving Butte County. About Buddy Rausch